{
    "lazyNodes": false,
    "abFitnotesFlag": false,
    "abCrawlReviews": false,
    "productOptionsCookie": false,
    "orderDelayFlag": false,
    "skipSessionCookie": false,
    "covidMessage": false,
    "fullTitleCookie": false,
    "nrLoggerCookie": false,
    "checkoutReviewCookie": false,
    "productOptionSeqCookie": false,
    "maintenanceFlag": false,
    "bufferETACookie": false,
    "multiShippingDiscountFlag": false,
    "newFitmentFlag": false,
    "surveyOptInFlag": false,
    "crossSellFlag": false,
    "skuMappingFlag": false,
    "paySplitCookie": false,
    "callDisableFlag": false,
    "zipPaymentFlag": "u",
    "hassleFreeReturn": false,
    "lifetimeReplacement": false,
    "cpn_off": false
}
Select your vehicle

SRT Oxygen Sensors

Refine by:
See All

Shop Catalog

Showing 1 - 15 of 29 results
Display item:
15
30
45
Sort by:
Oxygen Sensor, 4-Wire, Heated
Part Number: RD96090004
Vehicle Info Required to Guarantee Fit
$21.00
Product Details
Location : Before Catalytic Converter, After Secondary Catalytic Converter, Passenger Side - Before Catalytic Converter, After Catalytic Converter, Driver Side - Before Catalytic Converter, Passenger Side - After Catalytic Converter, Before Secondary Catalytic Converter, After Catalytic Converter, Passenger Side - Before Or After Catalytic Converter, Passenger Side - Before Catalytic Converter, Driver Side - Before Or After Catalytic Converter, Before Or After Primary Catalytic Converter, Before Or After Catalytic Converter, Before Catalytic Converter, Driver Side - After Catalytic Converter, After Catalytic Converter, After Primary Catalytic Converter, Before Catalytic Converter, Driver Side - Before Catalytic Converter, Driver Side, After Catalytic Converter, Driver Side - After Catalytic Converter, Before Catalytic Converter, Passenger Side - After Catalytic Converter, Before Catalytic Converter, Passenger Side - After Catalytic Converter, Passenger Side, After Catalytic Converter, Driver Side - Before Catalytic Converter, After Catalytic Converter, After Secondary Catalytic Converter, Before Catalytic Converter, Before Catalytic Converter, Driver Side - After Catalytic Converter, Passenger Side - After Catalytic Converter, Before Catalytic Converter, Passenger Side, Before Catalytic Converter, Before Or Aftfer Catalytic Converter, Before Catalytic Converter, After Primary Catalytic ConverterNotes : HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 12.8 in. Wire LengthInterchange Part Number : 25024680Warranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Returns Policy : 30-Day Return Policy
Oxygen Sensor, 4-wire, Heated
Part Number: ARBJ960907
Vehicle Info Required to Guarantee Fit
$18.00
Product Details
Location : Passenger Side - Before Catalytic Converter, After Catalytic Converter, Driver Side - Before Catalytic Converter, Passenger Side - After Catalytic Converter, Passenger Side - Before Catalytic Converter, Passenger Side - Before Or After Catalytic Converter, After Catalytic Converter, Driver Side - Before Catalytic Converter, Before Or After Catalytic Converter, Driver Side, After Catalytic Converter, Passenger Side - After Catalytic Converter, Driver Side - After Catalytic Converter, Passenger Side - Before Catalytic Converter, Driver Side, Before Catalytic Converter, Passenger Side, After Catalytic Converter, Before Catalytic Converter, Driver Side - After Catalytic ConverterType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 19.25 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024460Connector Gender : Male ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Returns Policy : 30-Day Return Policy
Oxygen Sensors, 4-Wire, Set Of 2
Part Number: SET-ARBJ960907-2
Vehicle Info Required to Guarantee Fit
$32.99
Product Details
Location : Before Catalytic Converter, Driver And Passenger Side, Before And After Catalytic Converter, Driver Or Passenger Side, Before And After Catalytic Converter, Before And After Catalytic Converter, Passenger Side, After Catalytic Converter, After Catalytic Converter, Driver And Passenger SideComponents : (2) Oxygen SensorsType : 4-wireQuantity Sold : Set of 2Product Fit : Direct FitWire Length : 19.25 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeConnector Gender : Male ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Returns Policy : 30-Day Return Policy
After Catalytic Converter Oxygen Sensors, 4-wire
Part Number: SET-ARBJ960907-4
Vehicle Info Required to Guarantee Fit
$66.49
Product Details
Location : Before Catalytic Converter, Driver And Passenger Side, Before Catalytic Converter, Before And After Catalytic Converter, After Catalytic Converter, After Catalytic Converter, Driver And Passenger Side, Before And After Catalytic Converter, Driver And Passenger SideComponents : (4) Oxygen SensorsType : 4-wireQuantity Sold : Set of 4Product Fit : Direct FitWire Length : 19.25 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeConnector Gender : Male ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Returns Policy : 30-Day Return Policy
350-34213 Walker Products Aftermarket Base Sensor Oxygen Sensor, Sold individually 4-wire
Part Number: WKP35034213
Vehicle Info Required to Guarantee Fit
$33.49
Product Details
Location : Before Catalytic Converter, After Secondary Catalytic Converter, Passenger Side - Before Catalytic Converter, After Catalytic Converter, Driver Side - Before Catalytic Converter, Passenger Side - After Catalytic Converter, Before Secondary Catalytic Converter, After Catalytic Converter, Before Or After Primary Catalytic Converter, After Catalytic Converter, Before Or After Catalytic Converter, Before Catalytic Converter, Driver Side - After Catalytic Converter, Driver Side, After Catalytic Converter, Passenger Side, Before Or After Catalytic Converter, Driver Side - After Catalytic Converter, Before Catalytic Converter, Before Catalytic Converter, Passenger Side - After Catalytic Converter, Passenger Side, After Catalytic Converter, Driver Side, Before Catalytic Converter, Before Catalytic Converter, Passenger Side - After Catalytic Converter, Before Catalytic Converter, Before Or Aftfer Catalytic Converter, Passenger Side, Before Catalytic Converter, Before Catalytic Converter, After Primary Catalytic ConverterNotes : HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 12.8 in. Wire LengthWarranty : 90-day Walker Products limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Walker Products Aftermarket Base Sensor
250-24680 Walker Products Original Equipment Base Sensor Oxygen Sensor, Sold individually 4-wire
Part Number: 25024680
Vehicle Info Required to Guarantee Fit
$43.49
Product Details
Location : Before Catalytic Converter, After Secondary Catalytic Converter, Passenger Side - Before Catalytic Converter, After Catalytic Converter, Driver Side - Before Catalytic Converter, Passenger Side - After Catalytic Converter, Before Secondary Catalytic Converter, After Catalytic Converter, Passenger Side - Before Or After Catalytic Converter, Passenger Side - Before Catalytic Converter, Driver Side - Before Or After Catalytic Converter, After Primary Catalytic Converter, Before Catalytic Converter, After Catalytic Converter, Before Or After Catalytic Converter, Driver Side - Before Catalytic Converter, Before Catalytic Converter, Driver Side - After Catalytic Converter, Before Or After Primary Catalytic Converter, Driver Side, After Catalytic Converter, Driver Side - After Catalytic Converter, Before Catalytic Converter, Passenger Side - After Catalytic Converter, Before Catalytic Converter, Passenger Side - After Catalytic Converter, Passenger Side, After Catalytic Converter, Driver Side - Before Catalytic Converter, After Catalytic Converter, After Secondary Catalytic Converter, Before Catalytic Converter, Before Catalytic Converter, Driver Side - After Catalytic Converter, Passenger Side - After Catalytic Converter, Before Catalytic Converter, Passenger Side, Before Catalytic Converter, Before Or Aftfer Catalytic Converter, Before Catalytic Converter, After Primary Catalytic ConverterNotes : HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 12.8 in. Wire LengthInterchange Part Number : RD96090004Warranty : 90-day Walker Products limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Walker Products Original Equipment Base Sensor
234-4545 Oxygen Sensor, Sold individually 4-wire
Part Number: NP2344545
Vehicle Info Required to Guarantee Fit
$41.99
Product Details
Location : Before Catalytic Converter, Passenger Side Or After Catalytic Converter, Before Catalytic Converter Or After Catalytic Converter, Passenger Side, After Catalytic Converter, Driver Side, After Catalytic Converter, Passenger Side, Before Catalytic Converter, Passenger Side, Before Catalytic Converter, Before Catalytic Converter, Driver Side Or After Catalytic Converter, Passenger Side, After Catalytic Converter, Before Or After Catalytic Converter, Driver Side, Before Or After Catalytic Converter, Before Or After Catalytic Converter, Passenger Side, Before Catalytic Converter, Passenger Side Or After Catalytic Converter, Driver SideType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitInterchange Part Number : 18125Connector Gender : Female ConnectorWarranty : 1-year Denso limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

18126 OE Replacement Series Oxygen Sensor, Sold individually 4-wire
Part Number: BS18126
Vehicle Info Required to Guarantee Fit
$39.99
Product Details
Location : Downstream, Passenger Side, Downstream, Driver Or Passenger Side, Downstream, Driver Side, Downstream, Upstream, Driver Side, Downstream Or Upstream, Upstream, After Catalytic Converter, Driver Side, After Catalytic Converter, Driver Side, Before Catalytic Converter, Passenger Side, After Catalytic Converter, Downstream; Upstream, Passenger Side, Downstream, Rear, Before Catalytic Converter, Downstream, Driver Side, Downstream Or Upstream, Passenger SideNotes : Heated Type; Metal Housing Material; Steel Color/FinishType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitMounting Style : Threaded-in Mounting StyleHex Size : 0.87 in. Hex SizeConnector Gender : Female ConnectorWarranty : 1-year Bosch limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Promotions : European Vehicle PartsSeries : OE Replacement Series
15510 OE Replacement Series Oxygen Sensor, Sold individually 4-wire
Part Number: BS15510
Vehicle Info Required to Guarantee Fit
$62.49
Product Details
Location : Driver Side - Before Catalytic Converter, Passenger Side - After Catalytic Converter, Driver Side, Before Or After Catalytic Converter, Before Catalytic Converter, Driver Side - After Catalytic Converter, Before Or After Catalytic Converter, After Catalytic Converter, Passenger Side, Before Or After Catalytic Converter, Passenger Side - Before Catalytic Converter, Driver Side - After Catalytic Converter, Driver Side, After Catalytic Converter, After Catalytic Converter, Passenger Side - Before Catalytic Converter, Before Catalytic Converter, Passenger Side - After Catalytic Converter, Driver Side, Before Catalytic Converter, Passenger Side, After Catalytic Converter, Before Catalytic Converter, Passenger Side, Before Catalytic ConverterNotes : Heated Sensor TypeType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 13.2 in. Wire LengthThread Size : 18 mm Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 22 mm Hex SizeConnector Gender : Female ConnectorWarranty : 1-year Bosch limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Promotions : European Vehicle PartsSeries : OE Replacement Series
350-34592 Walker Products Aftermarket Base Sensor Oxygen Sensor, Sold individually 4-wire
Part Number: WKP35034592
Vehicle Info Required to Guarantee Fit
$33.49
Product Details
Location : Passenger Side, Before Or After Catalytic Converter, Driver Side, Before Catalytic Converter, Passenger Side, After Catalytic Converter, Driver Side, Before Or After Catalytic Converter, Before Catalytic Converter, Passenger Side, Before Catalytic Converter, After Catalytic Converter, Before Or After Catalytic Converter, Driver Side, After Catalytic ConverterNotes : HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 18.7 in. Wire LengthWarranty : 90-day Walker Products limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Walker Products Aftermarket Base Sensor
234-4579 Oxygen Sensor, Sold individually 4-wire
Part Number: NP2344579
Vehicle Info Required to Guarantee Fit
$62.49
Product Details
Location : After Catalytic Converter, Driver Side, After Catalytic Converter, Passenger Side, Before Catalytic Converter, Before Catalytic Converter, Driver Side, After Catalytic ConverterType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWarranty : 1-year Denso limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

V33-76-0001 Oxygen Sensor, Sold individually
Part Number: Z8YV33760001
Vehicle Info Required to Guarantee Fit
$63.99
Product Details
Location : After Catalytic Converter, Driver Side Or Before Catalytic Converter, Passenger Side, After Catalytic Converter, Driver Or Passenger Side Or Before Catalytic Converter, Passenger Side, After Catalytic Converter, Rear Or Before Catalytic Converter, Front, After Catalytic Converter, Driver Side, After Catalytic Converter, Passenger Side, After Catalytic Converter, Driver Or Passenger Side, Before Catalytic Converter, Passenger Side, Before Catalytic Converter, Driver Side, Before Or After Catalytic Converter, Driver Or Passenger Side, Front, Before Catalytic Converter, Front, After Catalytic Converter, Before Or After Catalytic Converter, After Catalytic Converter, Passenger Side Or Before Catalytic Converter, Before Catalytic Converter, After Catalytic Converter, Passenger Side Or Before Catalytic Converter, Passenger Side, Before Or After Catalytic Converter, Passenger SideQuantity Sold : Sold individuallyProduct Fit : Direct FitReplaces OE Number : 7B0906265, 56028995AA, 56028995AB, 56029050AA, 56029051AA, 56029052AA, 56041699AA, 56044605AA, 68090640AA, 68090640AB, 0085427018, A0085427018, 560229050AAInterchange Part Number : 7B0906265, 56028995AA, 56028995AB, 56029050AA, 56029051AA, 56029052AA, 56041699AA, 56044605AA, 68090640AA, 68090640AB, 0085427018, A0085427018, 560229050AAWarranty : 24-month or 24,000-mile Vemo limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Promotions : European Vehicle Parts
250-24460 Walker Products Original Equipment Base Sensor Oxygen Sensor, Sold individually 4-wire
Part Number: 25024460
Vehicle Info Required to Guarantee Fit
$40.99
Product Details
Location : Passenger Side - Before Catalytic Converter, After Catalytic Converter, Passenger Side - Before Catalytic Converter, Driver Side - Before Catalytic Converter, Passenger Side - After Catalytic Converter, Passenger Side - Before Or After Catalytic Converter, After Catalytic Converter, Driver Side - Before Catalytic Converter, Before Or After Catalytic Converter, Driver Side, After Catalytic Converter, Passenger Side - After Catalytic Converter, Driver Side - After Catalytic Converter, Passenger Side - Before Catalytic Converter, Driver Side, Before Catalytic Converter, Passenger Side, After Catalytic Converter, Before Catalytic Converter, Driver Side - After Catalytic ConverterNotes : HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 18.7 in. Wire LengthInterchange Part Number : ARBJ960907Warranty : 90-day Walker Products limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Walker Products Original Equipment Base Sensor
23162 Oxygen Sensor, Sold individually 4-wire
Part Number: NG23162
Vehicle Info Required to Guarantee Fit
$47.49
Product Details
Location : Passenger Side, Before Or After Catalytic Converter, Passenger Side - Before Catalytic Converter, After Catalytic Converter, After Catalytic Converter, Passenger Side - Before Catalytic Converter, Before Catalytic Converter, Passenger Side - After Catalytic Converter, Passenger Side, After Catalytic Converter, Driver Side - Before Catalytic Converter, Passenger Side - After Catalytic Converter, Before Catalytic Converter, Passenger Side, Before Catalytic Converter, Before Catalytic Converter, Driver Side - After Catalytic Converter, Before Or After Catalytic Converter, After Catalytic Converter, Driver Side, After Catalytic ConverterNotes : Heated Sensor TypeType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 10 in. Wire LengthThread Size : 18 mm Thread SizeMounting Style : Threaded-in Mounting StyleWarranty : NGK limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

18125 OE Replacement Series Oxygen Sensor, Sold individually
Part Number: BS18125
Vehicle Info Required to Guarantee Fit
$62.99
Product Details
Location : Passenger Side - Before Catalytic Converter, After Catalytic Converter, Driver Side - Before Catalytic Converter, Passenger Side - After Catalytic Converter, Driver Side, Before Or After Catalytic Converter, Before Secondary Catalytic Converter, Before Catalytic Converter, Driver Side - After Catalytic Converter, Before Or After Catalytic Converter, After Catalytic Converter, Passenger Side, Before Or After Catalytic Converter, Passenger Side - Before Catalytic Converter, Driver Side - After Catalytic Converter, Driver Side, After Catalytic Converter, Before Catalytic Converter, Passenger Side - After Catalytic Converter, Driver Side, Before Catalytic Converter, Passenger Side, After Catalytic Converter, Driver Side - Before Catalytic Converter, After Catalytic Converter, Before Catalytic Converter, Passenger Side, Before Catalytic ConverterNotes : Heated Sensor TypeQuantity Sold : Sold individuallyProduct Fit : Direct FitMounting Style : Threaded-in Mounting StyleHex Size : 22 mm Hex SizeInterchange Part Number : 2344545Connector Gender : Female ConnectorWarranty : 1-year Bosch limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Promotions : European Vehicle PartsSeries : OE Replacement Series
Page 1 of 2 | Showing 1 - 15 of 29 results

Top Rated Products

All I have to say is spot on with everyone at car parts
Floyd D C.
VERIFIED PURCHASER
Love ordering parts from <a href="http://carparts.com" target="_blank">carparts.com</See More
Victoria G.
VERIFIED PURCHASER

Product Questions & Answers

Q:How many oxygen sensors are on a 2014 Dodge Ram1500?
Vernon P.
A:BEST ANSWERHi Vernon, thank you for reaching out! There are 4. Kindly call our parts team at 1-866-529-0412 if you need assistance in looking for parts. You also need to provide the submodel and engine size to ensure the parts will fit. Have a good one! Show less
Andrew B.
 
2 Questions, 1 AnswerView all Q&As >
Q:02 sensor slow circuit response what’s the correct part to fix this problem ? Show Less
Quinton J.
A:BEST ANSWERHi Quinton, thank you for reaching out. We are unable to answer your question accurately due to a lack of information. Kindly call our parts team at 1-866-529-0412 and tell us more about your vehicle. Have a nice day. Show less
Aldrin P.
 
3 Questions, 1 AnswerView all Q&As >
Q:Can you give me the parts # for 2017 Dodge Charger RT Bank 1 Sensor 1 & 2? Show Less
Derick W.
A:BEST ANSWERHi Derick, I'm glad to assist you. Since you did not mention if you need the upstream or downstream only. I will quote you both. The matching set of oxygen sensors for your car (upstream and downstream) is part number SET-ARBJ960903-4. Grab our best offer and click the link below to buy it today. Happy shopping! https://www.carparts.com/details/Dodge/Charger/DriveWire/Oxygen_Sensor/2017/R-fs-T/8_Cyl_5-dot-7L/SET-ARBJ960903-4.html?can=cpje1043_CSQA_20240516 Show less
Jeonino E.
 
5 Questions, 1 AnswerView all Q&As >

Helpful Automotive Resources

P0141 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
P0141 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)P0141 is part of a family of codes listed as follows: P0141 – Sensor Heater Circuit Bank 1 Sensor 2 P0161 – Sensor Heater Circuit Bank 2 Sensor 2 P0135 – O2 Sensor Heater Circuit Bank 1 Sensor 1 P0155 – O2 Heater Circuit Bank 2, Sensor 1 Make sure you know bank 1 from
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3When there are only 3 O2 sensors it’s typically because there’s only one catalyst being monitored, and “Bank 1” is the default designation when there’s only one sensor in a category. Diagram showing 3 oxygen sensors | Image Source: Richard McCuistian
P0135 Code: Heated O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
P0135 Code: Heated O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)Due to this, the O2 sensor features an integrated heater circuit to bring it up to operating temperature after a cold start. When this circuit stops functioning properly, it can trigger a P0135. The oxygen sensor monitors your vehicle’s air-to-fuel ratio. What Does the P0135 Code Mean?