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1991 Pontiac Grand Prix

Oxygen Sensors

Some telltale signs that your oxygen sensor is starting to fail include the check engine light coming on, poor fuel economy, and the engine running rough. Get a replacement as soon as you confirm that your oxygen sensor is bad. The great news is that here at CarParts.com, we have an oxygen sensor replacement for every application (upstream, downstream, before/after the catalytic converter, etc.). Choose from our wide range of high-quality O2 sensors manufactured by the most reputable names in the industry.
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Before Catalytic Converter, Driver or Passenger Side Oxygen Sensor, 1-Wire, Unheated
Part Number: ARBC960901
Guaranteed to Fit
$19.55
Vehicle Fitment
  • 1991 Pontiac Grand Prix LE 4 Cyl 2.3L B1S1
  • 1991 Pontiac Grand Prix LE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix SE 4 Cyl 2.3L B1S1
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.1L
Product Details
Location : Before Catalytic ConverterType : 1-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 18.25 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25021001Connector 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
Before Catalytic Converter Oxygen Sensors, 2.3L/3.1L/3.4L Engine, 1-Wire, Non-Heated, Set Of 2
Part Number: SET-ARBC960901
Guaranteed to Fit
$19.49
Vehicle Fitment
  • 1991 Pontiac Grand Prix LE 4 Cyl 2.3L Engine VIN: D, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix LE 6 Cyl 3.1L Engine VIN: T, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.4L Engine VIN: X, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.1L Engine VIN: T, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix SE 4 Cyl 2.3L Engine VIN: D, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.1L Engine VIN: T, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.4L Engine VIN: X, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.4L Engine VIN: X, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.1L Engine VIN: T, FI, Naturally Aspirated, GAS
Product Details
Location : Before Catalytic ConverterComponents : (2) Oxygen SensorsType : 1-wireQuantity Sold : Set of 2Product Fit : Direct FitWire Length : 18.25 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
Before Catalytic Converter Walker Products Original Equipment Base Sensor Oxygen Sensor, Sold individually 1-wire
Part Number: 25021001
Guaranteed to Fit
$32.49
Vehicle Fitment
  • 1991 Pontiac Grand Prix LE 4 Cyl 2.3L B1S1
  • 1991 Pontiac Grand Prix LE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix SE 4 Cyl 2.3L B1S1
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.1L
Product Details
Location : Before Catalytic ConverterNotes : Non-HeatedType : 1-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 14.57 in. Wire LengthReplaces OE Number : 8990741, 8990741Interchange Part Number : ARBC960901Warranty : 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
Oxygen Sensor, Sold individually 1-wire
Part Number: DELES10966
Guaranteed to Fit
$25.49
Vehicle Fitment
  • 1991 Pontiac Grand Prix LE 4 Cyl 2.3L With 320mm Overall Length
  • 1991 Pontiac Grand Prix LE 6 Cyl 3.1L With 320mm Overall Length
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.4L With 320mm Overall Length
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.1L With 320mm Overall Length
  • 1991 Pontiac Grand Prix SE 4 Cyl 2.3L With 320mm Overall Length
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.1L With 320mm Overall Length
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.4L With 320mm Overall Length
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.4L With 320mm Overall Length
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.1L With 320mm Overall Length
Product Details
Type : 1-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 12.60 in. Wire LengthThread Size : 18 x 1.5 mm Thread SizeInterchange Part Number : 12014, 2341000Warranty : 1-year or 12,000-mile Delphi 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.

OE Replacement Series Oxygen Sensor, Sold individually 1-wire
Part Number: BS11027
Guaranteed to Fit
$20.49
Vehicle Fitment
  • 1991 Pontiac Grand Prix LE 4 Cyl 2.3L OE manufactured part
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.4L OE manufactured part
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.1L OE manufactured part
  • 1991 Pontiac Grand Prix SE 4 Cyl 2.3L OE manufactured part
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.1L OE manufactured part
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.4L OE manufactured part
  • 1991 Pontiac Grand Prix LE 6 Cyl 3.1L OE manufactured part
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.4L OE manufactured part
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.1L OE manufactured part
Product Details
Location : Before Catalytic ConverterType : 1-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitInterchange Part Number : 12014, 2341000Warranty : 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
Before Catalytic Converter Walker Products Aftermarket Base Sensor Oxygen Sensor, Sold individually 1-wire
Part Number: WKP35031027
Guaranteed to Fit
$17.49
Vehicle Fitment
  • 1991 Pontiac Grand Prix LE 4 Cyl 2.3L Eng. VIN: D, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix LE 6 Cyl 3.1L Eng. VIN: T, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.4L Eng. VIN: X, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.1L Eng. VIN: T, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix SE 4 Cyl 2.3L Eng. VIN: D, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.1L Eng. VIN: T, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.4L Eng. VIN: X, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.4L Eng. VIN: X, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.1L Eng. VIN: T, FI, Naturally Aspirated, GAS
Product Details
Location : Before Catalytic ConverterNotes : Non-HeatedType : 1-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 14.57 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
Before Catalytic Converter Oxygen Sensor, Sold individually 1-wire
Part Number: NG21002
Guaranteed to Fit
$24.49
Vehicle Fitment
  • 1991 Pontiac Grand Prix LE 4 Cyl 2.3L
  • 1991 Pontiac Grand Prix LE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix SE 4 Cyl 2.3L
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.1L
Product Details
Location : Before Catalytic ConverterNotes : Non Heated Sensor TypeType : 1-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 15.25 in. Wire LengthThread Size : 18 mm Thread SizeMounting Style : Threaded-in Mounting StyleInterchange Part Number : 12014, 2341000Warranty : 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.

OE Replacement Series Oxygen Sensor, Sold individually 1-wire
Part Number: BS12014
Guaranteed to Fit
$21.49
Vehicle Fitment
  • 1991 Pontiac Grand Prix LE 4 Cyl 2.3L OE manufactured part
  • 1991 Pontiac Grand Prix LE 6 Cyl 3.1L OE manufactured part
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.4L OE manufactured part
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.1L OE manufactured part
  • 1991 Pontiac Grand Prix SE 4 Cyl 2.3L OE manufactured part
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.1L OE manufactured part
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.4L OE manufactured part
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.4L OE manufactured part
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.1L OE manufactured part
Product Details
Location : UpstreamType : 1-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 14.6 in. Wire LengthReplaces OE Number : 8990741Interchange Part Number : 2341000Warranty : 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
Before Catalytic Converter Oxygen Sensor, 1-Wire, 4/6 Cyl., 2.3/3.1/3.4L Engines
Part Number: JARBC960901
Guaranteed to Fit
$19.55
Vehicle Fitment
  • 1991 Pontiac Grand Prix LE 4 Cyl 2.3L B1S1
  • 1991 Pontiac Grand Prix LE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix SE 4 Cyl 2.3L B1S1
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.1L
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.4L
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.1L
Product Details
Location : Before Catalytic ConverterType : 1-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 18.25 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25021001Connector Gender : Male ConnectorWarranty : 1-year JC Whitney 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
Before Catalytic Converter Oxygen Sensors, 1-Wire, 4/6 Cyl., 2.3/3.1/3.4L Engines
Part Number: SET-JARBC960901
Guaranteed to Fit
$30.99
Vehicle Fitment
  • 1991 Pontiac Grand Prix LE 4 Cyl 2.3L B1S1
  • 1991 Pontiac Grand Prix LE 6 Cyl 3.1L enginevinnname: T, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.4L enginevinnname: X, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix SE 6 Cyl 3.1L enginevinnname: T, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix SE 4 Cyl 2.3L B1S1
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.1L enginevinnname: T, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix STE 6 Cyl 3.4L enginevinnname: X, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.4L enginevinnname: X, FI, Naturally Aspirated, GAS
  • 1991 Pontiac Grand Prix GT 6 Cyl 3.1L enginevinnname: T, FI, Naturally Aspirated, GAS
Product Details
Location : Before Catalytic ConverterComponents : (2) Oxygen SensorsType : 1-wireQuantity Sold : Set of 2Product Fit : Direct FitWire Length : 18.25 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 JC Whitney 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
Atomic, O2 Sensor Wideband
Part Number: M46A2930
Universal Fit
$131.35
Product Details
Quantity Sold : Sold individuallyProduct Fit : UniversalWarranty : 1-year MSD 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.

Universal Oxygen Sensor 3-Wire – Sold Individually.
Part Number: WKP250-23200
Universal Fit
$57.99
Product Details
Notes : 20.0 Wire Gauge Measurement; 18mm. Thread DiameterQuantity Sold : Sold individuallyProduct Fit : UniversalWarranty : 90-day Walker Products limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Nickel (Metallic), 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
Oxygen Sensor - Universal, May Require Modification
Part Number: BS15741
Universal Fit
$46.49
Product Details
Notes : Heated Type; Metal Housing Material; Steel Color/FinishType : 4-wireQuantity Sold : Sold individuallyProduct Fit : UniversalWire Length : 27 in. Wire LengthMounting Style : Threaded-in Mounting StyleHex Size : 22 mm Hex SizeConnector Gender : Female ConnectorWarranty : 1-year Bosch limited warrantyPromotions : European Vehicle PartsSeries : OE Replacement Series
Walker Products Aftermarket Base Sensor Oxygen Sensor, Sold individually 4-wire
Part Number: WKP350-34200
Universal Fit
$31.49
Product Details
Notes : 9.37 in. Overall Length; Heated Sensor Type; 20 Wire Gauge MeasurementType : 4-wireQuantity Sold : Sold individuallyProduct Fit : UniversalWire Length : 5.83 in. Wire LengthThread Size : 18 mm Thread SizeMounting Style : Threaded-in Mounting StyleWarranty : 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
Universal Oxygen Sensor 4-Wire – Sold Individually
Part Number: 25024400
Universal Fit
$48.99
Product Details
Notes : 20.0 Wire Gauge Measurement; 18.0 mm Thread DiameterType : 4-wireQuantity Sold : Sold individuallyProduct Fit : UniversalWire Length : 8.25 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 Original Equipment Base Sensor
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Product Questions & Answers

Q:Can I purchase all 4 sensors for my 2011 Ram 2500?
Dale F.
A:BEST ANSWERHi Dale, thank you for reaching out. Kindly call our parts team at 1-866-529-0412, so we can help you look for the correct sensors based on your complete vehicle information. Hope to hear from you soon. Show less
Aldrin P.
 
5 Questions, 1 AnswerView all Q&As >
Q:Is this upstream or downstream?
Nef79
A:BEST ANSWERHi Neftaly, I'm glad to assist you. This is a wideband and heated type of universal oxygen sensor. This is commonly used for the front or rear location and you will need to reuse your original connector after some splicing and cutting. Please provide your complete vehicle application and engine size (year, make, model, submodel and engine size.) so we could identify the correct direct fit oxygen sensor for your car. Take advantage of our clearance sale for this part while supply lasts. I hope this helps. Happy shopping. https://www.carparts.com/oxygen-sensor/walker-products/wkp350-34200?can=CPJE1043 Show less
Jeonino E.
 
5 Questions, 1 AnswerView all Q&As >
Q:Will this part replace a Nox sensor 1 for a 2018 Chevrolet Equinox LT Diesel Turbo engine? Show Less
Jen
A:BEST ANSWERHi Jennifer, thank you for reaching out. This universal product may require some modifications to replace the oxygen sensor of the 2018 Chevrolet Equinox LT with a 1.6-liter diesel engine. This part isn't specific to any vehicle. Should you decide to order this part, you can use this link to order this part at a discounted price today while supplies last: https://www.carparts.com/oxygen-sensor/bosch/bs15741?can=CPAP3648_CSQA_20241013 I hope this helps. Enjoy shopping. Show less
Aldrin P.
 
5 Questions, 1 AnswerView all Q&As >

Shopping for Oxygen Sensor

Oxygen Sensor Shopping Info

What Is an Oxygen Sensor?

Modern vehicles are equipped with oxygen sensors, which monitor the amount of oxygen in the exhaust pipe. This part works with the engine control module to maintain your vehicle’s performance and keep its emissions in check.

How Much Does an Oxygen Sensor Replacement Cost?

Replacement oxygen sensors cost anywhere from $10 to $600 for the part alone. Factors that affect this part’s pricing include quantity, location, sensor type, and kit inclusions. Labor can cost you an additional $60 to $70, depending on where you live.

Shop for Aftermarket Oxygen Sensors on CarParts.com

Need to get an OE-grade oxygen sensor replacement fast? Here at CarParts.com, you don’t have to wait in line at a brick-and-mortar store just to get the part you need. With just a few clicks, you can get your orders delivered right to your doorstep in as fast as two business days.

Oxygen sensor replacements are typically sold individually, but you can also purchase them in sets of two or in kits that include catalytic converters. They’re also sold in a variety of inlet types and dimensions, so make sure to double-check if you’ve chosen a part with the right specifications.

With all these options and specifications to look out for, shopping for oxygen sensors can seem like an intimidating task. But with our user-friendly website, you can buy the right oxygen sensor in just a few clicks. Our products are manufactured in world-class facilities and have gone through strict tests to ensure their quality. This way, you can rest easy knowing that you’re getting high-quality products at unbeatable prices.

To view oxygen sensors and other compatible parts for your vehicle, use our vehicle selector tool and enter your vehicle’s specific year, make, and model. You can also indicate your preferences using our search filters. Buying oxygen sensors is easy and convenient here at CarParts.com. Shop now!

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?