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2012 Nissan Frontier
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2012 Nissan Frontier

2012 Nissan Frontier Oxygen Sensors

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Before Catalytic Converter, Driver or Passenger Side Oxygen Sensor, Sold Individually, 4-Wire, 6 Cyl., 4.0L VQ40DE Engine, FI, Naturally Aspirated, GAS
DriveWire
Before Catalytic Converter, Driver or Passenger Side Oxygen Sensor, Sold Individually, 4-Wire, 6 Cyl., 4.0L VQ40DE Engine, FI, Naturally Aspirated, GAS
Part Number: REPN960915
Guaranteed to Fit
$50.49
Vehicle Fitment
  • 2012 Nissan Frontier S 6 Cyl 4.0L VQ40DE Engine, FI, Naturally Aspirated, GAS
  • 2012 Nissan Frontier SL 6 Cyl 4.0L VQ40DE Engine, FI, Naturally Aspirated, GAS
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L VQ40DE Engine, FI, Naturally Aspirated, GAS
  • 2012 Nissan Frontier SV 6 Cyl 4.0L VQ40DE Engine, FI, Naturally Aspirated, GAS
Product Details
Location : Before Catalytic Converter, Driver or Passenger SideNotes : Before Catalytic Converter, 4-Wire, Air-Fuel RatioType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 12.32 in. Wire LengthThread Size : 18 mm Thread SizeInterchange Part Number : 25054035Connector 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 Sensor, PRO-4X/S/SL/SV Models, 4.0L Engine VQ40DE; FI, Naturally Aspirated, GAS, 4-wire, Male Connector
DriveWire
Before Catalytic Converter Oxygen Sensor, PRO-4X/S/SL/SV Models, 4.0L Engine VQ40DE; FI, Naturally Aspirated, GAS, 4-wire, Male Connector
Part Number: SET-REPN960915-2
Guaranteed to Fit
$98.99
Vehicle Fitment
  • 2012 Nissan Frontier S 6 Cyl 4.0L VQ40DE Engine, FI, Naturally Aspirated, GAS
  • 2012 Nissan Frontier SL 6 Cyl 4.0L VQ40DE Engine, FI, Naturally Aspirated, GAS
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L VQ40DE Engine, FI, Naturally Aspirated, GAS
  • 2012 Nissan Frontier SV 6 Cyl 4.0L VQ40DE Engine, FI, Naturally Aspirated, GAS
Product Details
Location : Before Catalytic ConverterNotes : 4-Wire, Air-Fuel RatioComponents : (2) Oxygen SensorsType : 4-wireQuantity Sold : Set of 2Product Fit : Direct FitWire Length : 12.32 in. Wire LengthThread Size : 18 mm Thread 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
Oxygen Sensor (Driver Side - After Catalytic Converter, PRO-4X/S/SL/SV Models, 4.0L Engine VQ40DE)/(After Catalytic Converter, S/SV Models, 2.5L Engine QR25DE; B1S2), 4-wire
DriveWire
Oxygen Sensor (Driver Side - After Catalytic Converter, PRO-4X/S/SL/SV Models, 4.0L Engine VQ40DE)/(After Catalytic Converter, S/SV Models, 2.5L Engine QR25DE; B1S2), 4-wire
Part Number: RN96090011
Guaranteed to Fit
$21.49
Vehicle Fitment
  • 2012 Nissan Frontier S 6 Cyl 4.0L
  • 2012 Nissan Frontier SL 6 Cyl 4.0L
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L
  • 2012 Nissan Frontier SV 4 Cyl 2.5L B1S2
  • 2012 Nissan Frontier S 4 Cyl 2.5L B1S2
  • 2012 Nissan Frontier SV 6 Cyl 4.0L
Product Details
Location : Driver Side - After Catalytic ConverterNotes : HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 10.83 in. Wire LengthInterchange Part Number : 25024951Warranty : 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
Passenger Side - After Catalytic Converter Oxygen Sensor, PRO-4X/S/SL/SV Models, 4.0L Engine VQ40DE, 4-wire, Male Connector
DriveWire
Passenger Side - After Catalytic Converter Oxygen Sensor, PRO-4X/S/SL/SV Models, 4.0L Engine VQ40DE, 4-wire, Male Connector
Part Number: ARBN960913
Guaranteed to Fit
$22.99
Vehicle Fitment
  • 2012 Nissan Frontier S 6 Cyl 4.0L
  • 2012 Nissan Frontier SL 6 Cyl 4.0L
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L
  • 2012 Nissan Frontier SV 6 Cyl 4.0L
Product Details
Location : Passenger Side - After Catalytic ConverterNotes : Downstream (After Catalytic converter)Type : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 19 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024403Connector 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 Sensor, Set of 2 4-wire
DriveWire
Oxygen Sensor, Set of 2 4-wire
Part Number: SET-ARBN960913-2A
Guaranteed to Fit
$39.49
Vehicle Fitment
  • 2012 Nissan Frontier S 6 Cyl 4.0L
  • 2012 Nissan Frontier SL 6 Cyl 4.0L
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L
  • 2012 Nissan Frontier SV 6 Cyl 4.0L
Product Details
Location : Driver and Passenger Side - After Catalytic ConverterType : 4-wireQuantity Sold : Set of 2Product Fit : Direct FitInterchange Part Number : 25024403, 25024951Warranty : 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 Sensor, Sold individually 5-wire
NTK®
Before Catalytic Converter Oxygen Sensor, Sold individually 5-wire
Part Number: NG24320
Guaranteed to Fit
$108.99
Vehicle Fitment
  • 2012 Nissan Frontier SV 4 Cyl 2.5L
  • 2012 Nissan Frontier S 4 Cyl 2.5L
Product Details
Location : Before Catalytic ConverterNotes : 0.38 in. Thread Length; Heated Sensor TypeType : 5-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 23.5 in. Wire LengthThread Size : 18 mm Thread SizeMounting Style : Non-flanged 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.

Before Catalytic Converter Walker Products Aftermarket Base Sensor Oxygen Sensor, Sold individually 5-wire
Walker Products®
Before Catalytic Converter Walker Products Aftermarket Base Sensor Oxygen Sensor, Sold individually 5-wire
Part Number: WKP35035009
Guaranteed to Fit
$81.99
Vehicle Fitment
  • 2012 Nissan Frontier SV 4 Cyl 2.5L enginedesignationname: QR25DE, FI, Naturally Aspirated, GAS, B1S1
  • 2012 Nissan Frontier S 4 Cyl 2.5L enginedesignationname: QR25DE, FI, Naturally Aspirated, GAS, B1S1
Product Details
Location : Before Catalytic ConverterNotes : Wideband sensorType : 5-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 23.62 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
Front, Passenger Side Catalytic Converter Kit, CARB and Federal EPA Standards, 50-state Legal, 6 Cyl., 4.0L Engine, Direct Fit, includes Oxygen Sensor
Magnaflow®
Front, Passenger Side Catalytic Converter Kit, CARB and Federal EPA Standards, 50-state Legal, 6 Cyl., 4.0L Engine, Direct Fit, includes Oxygen Sensor
Part Number: KIT-083023-44
Guaranteed to Fit
$1,887.99
Vehicle Fitment
  • 2012 Nissan Frontier SL 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Cnsxt04.0G6A
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Cnsxt04.0G6A
  • 2012 Nissan Frontier SV 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Cnsxt04.0G6A
  • 2012 Nissan Frontier S 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Cnsxt04.0G6A
Product Details
Location : Front, Passenger SideEmissions : CARB and Federal EPA Standards, 50-state LegalComponents : (1) Catalytic Converter and (1) Oxygen SensorType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : KitEO Number : D-193-148Gasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Magnaflow limited warrantyReturns Policy : 30-Day Return PolicyProp 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.

Interchange Part Number : 25054035Promotions : Magnaflow Catalytic Converter SaleTube Material : Stainless Steel
Front, Passenger Side Catalytic Converter Kit, CARB and Federal EPA Standards, 50-state Legal, 6 Cyl., 4.0L Engine, Direct Fit, includes Oxygen Sensor
Magnaflow®
Front, Passenger Side Catalytic Converter Kit, CARB and Federal EPA Standards, 50-state Legal, 6 Cyl., 4.0L Engine, Direct Fit, includes Oxygen Sensor
Part Number: KIT-083023-41
Guaranteed to Fit
$1,887.99
Vehicle Fitment
  • 2012 Nissan Frontier S 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Cnsxt04.0G6A
  • 2012 Nissan Frontier SL 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Cnsxt04.0G6A
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Cnsxt04.0G6A
  • 2012 Nissan Frontier SV 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Cnsxt04.0G6A
Product Details
Location : Front, Passenger SideEmissions : CARB and Federal EPA Standards, 50-state LegalComponents : (1) Catalytic Converter and (1) Oxygen SensorType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : KitEO Number : D-193-148Gasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Magnaflow limited warrantyReturns Policy : 30-Day Return PolicyProp 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.

Interchange Part Number : 25024403Promotions : Magnaflow Catalytic Converter SaleTube Material : Stainless Steel
Walker Products Original Equipment Base Sensor Oxygen Sensor, Sold individually 4-wire
Walker Products®
Walker Products Original Equipment Base Sensor Oxygen Sensor, Sold individually 4-wire
Part Number: WKP25024951
Guaranteed to Fit
$87.49
Vehicle Fitment
  • 2012 Nissan Frontier S 6 Cyl 4.0L
  • 2012 Nissan Frontier SL 6 Cyl 4.0L
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L
  • 2012 Nissan Frontier SV 4 Cyl 2.5L B1S2
  • 2012 Nissan Frontier S 4 Cyl 2.5L B1S2
  • 2012 Nissan Frontier SV 6 Cyl 4.0L
Product Details
Location : Driver Side - After Catalytic ConverterNotes : HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 10.83 in. Wire LengthInterchange Part Number : RN96090011Warranty : 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 4-wire
Denso®
Oxygen Sensor, Sold individually 4-wire
Part Number: NP2349036
Guaranteed to Fit
$150.99
Vehicle Fitment
  • 2012 Nissan Frontier SL 6 Cyl 4.0L
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L
  • 2012 Nissan Frontier S 6 Cyl 4.0L
  • 2012 Nissan Frontier SV 6 Cyl 4.0L
Product Details
Location : Before Catalytic ConverterType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 14.53 in. Wire LengthThread Size : M18 Thread SizeInterchange Part Number : 15730, SG300Connector Gender : Male 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.

Oxygen Sensor, Sold individually 4-wire
NTK®
Oxygen Sensor, Sold individually 4-wire
Part Number: NG24247
Guaranteed to Fit
$130.99
Vehicle Fitment
  • 2012 Nissan Frontier S 6 Cyl 4.0L
  • 2012 Nissan Frontier SL 6 Cyl 4.0L
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L
  • 2012 Nissan Frontier SV 6 Cyl 4.0L
Product Details
Location : Passenger Side, After Catalytic ConverterNotes : Heated Sensor TypeType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 10.75 in. Wire LengthThread Size : 18 mm Thread SizeMounting Style : Threaded-in Mounting StyleInterchange Part Number : 15730, SG300Warranty : 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.

Walker Products Original Equipment Base Sensor Oxygen Sensor, Sold individually 4-wire
Walker Products®
Walker Products Original Equipment Base Sensor Oxygen Sensor, Sold individually 4-wire
Part Number: 25024403
Guaranteed to Fit
$67.49
Vehicle Fitment
  • 2012 Nissan Frontier S 6 Cyl 4.0L
  • 2012 Nissan Frontier SL 6 Cyl 4.0L
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L
  • 2012 Nissan Frontier SV 6 Cyl 4.0L
Product Details
Location : Passenger Side - After Catalytic ConverterNotes : HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 18.9 in. Wire LengthInterchange Part Number : ARBN960913Warranty : 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 4-wire
NTK®
Oxygen Sensor, Sold individually 4-wire
Part Number: NG24244
Guaranteed to Fit
$83.99
Vehicle Fitment
  • 2012 Nissan Frontier S 6 Cyl 4.0L
  • 2012 Nissan Frontier SL 6 Cyl 4.0L
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L
  • 2012 Nissan Frontier SV 4 Cyl 2.5L
  • 2012 Nissan Frontier S 4 Cyl 2.5L
  • 2012 Nissan Frontier SV 6 Cyl 4.0L
Product Details
Location : After Catalytic ConverterNotes : Heated Sensor TypeType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 10.75 in. Wire LengthThread Size : 18 mm Thread SizeMounting Style : Threaded-in Mounting StyleInterchange Part Number : 2344210Warranty : 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.

Walker Products Aftermarket Base Sensor Oxygen Sensor, Sold individually 4-wire
Walker Products®
Walker Products Aftermarket Base Sensor Oxygen Sensor, Sold individually 4-wire
Part Number: WKP35034384
Guaranteed to Fit
$39.99
Vehicle Fitment
  • 2012 Nissan Frontier S 6 Cyl 4.0L Eng. Designation: VQ40DE, FI, Naturally Aspirated, GAS
  • 2012 Nissan Frontier SL 6 Cyl 4.0L Eng. Designation: VQ40DE, FI, Naturally Aspirated, GAS
  • 2012 Nissan Frontier PRO-4X 6 Cyl 4.0L Eng. Designation: VQ40DE, FI, Naturally Aspirated, GAS
  • 2012 Nissan Frontier SV 6 Cyl 4.0L Eng. Designation: VQ40DE, FI, Naturally Aspirated, GAS
Product Details
Location : Passenger Side, After Catalytic ConverterNotes : HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 18.9 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
Page 1 of 5 | Showing 1 - 15 of 67 results

Popular Products

Product Questions & Answers

Walker Products Walker Products Aftermarket Base Sensor Oxygen Sensor, Sold individually 4-wire
$39.99
Q:where do wkp35034384 goes at rear or front catalic converter ?
Donyae B.
A:BEST ANSWERHi Donyae, thank you for reaching out. This is a downstream sensor. It's located at the rear of the converter. Use the link below to order the part and take advantage of the sale price. Have a good one. https://www.carparts.com/oxygen-sensor/walker-products/wkp35034384?can=cpab2020 Show less
Andrew B.
 
1 Question, 1 AnswerView all Q&As >
NTK Oxygen Sensor, Sold individually 4-wire
$83.99
Q:Is this the upstream or downstream?
Shonda L.
A:BEST ANSWERHi Shonda, I'm glad to assist you. This is for the downstream. If you're interested in this oxygen sensor, you can click on the link below for direct ordering to take advantage of our ongoing discount and limited stocks. I hope this helps, and happy shopping. https://www.carparts.com/oxygen-sensor/ntk/ng24244?can=CPAE1047_CSQA_20240319 Show less
Arnel E.
 
1 Question, 1 AnswerView all Q&As >
Walker Products Walker Products Original Equipment Base Sensor Oxygen Sensor, Sold individually 4-wire
$67.49
Q:Is this the 02 sensor for the passenger side, bank 1 sensor 2 for a 2006 Nissan Pathfinder LE ? Show Less
Patricia C.
A:BEST ANSWERHi Patricia, I'm happy to assist you. Yes. This item is the passenger's side downstream (sensor 2) oxygen sensor for the 2006 Nissan Pathfinder LE. Click this link to order the part at 40% off the regular price today while supplies last: https://www.carparts.com/oxygen-sensor/walker-products/25024403?can=CPAP3648_20220709 I hope this helps. Enjoy shopping at Carparts.com! Show less
Aldrin P.
 
1 Question, 1 AnswerView all Q&As >

Helpful Automotive Resources

P2187 Code: System too Lean at Idle (Bank 1)
P2187 Code: System too Lean at Idle (Bank 1)Note that there is only one bank if your car has a straight engine and the scan tool will always refer to that bank as “Bank 1.” P2187 code indicates that your vehicle’s computer detected a potential issue with the fuel mixture at idle.
P2270 Code: O2 Sensor Signal Biased / Stuck Lean (Bank 1, Sensor 2)
P2270 Code: O2 Sensor Signal Biased / Stuck Lean (Bank 1, Sensor 2)Bank 1 is where the #1 spark plug is. O2 sensor 1/1 is the upstream sensor on Bank 1 (different for a Ford than for a Chevy or a Dodge), and O2 sensor 1/2 is the downstream sensor on Bank 1. O2 2/1 is upstream on Bank 2 and O2
P0141 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
P0141 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)With that in mind, it’s important to note that Bank 1 is always where the number 1 cylinder is located. Thus, on Ford pickups, Bank 1 is the passenger side bank, but on Chevy and Dodge pickups, Bank 1 is the driver side bank. You need to know this, or
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3Bank 1 is the side of the engine where the #1 cylinder is located. P0042 code is set when your car’s PCM determines a potential problem with the heater element circuit of the oxygen sensor.
P0135 Code: Heated O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
P0135 Code: Heated O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)Diagnostic trouble code (DTC) P0135 stands for “Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1).” It is set when the car’s primary computer—also called the powertrain control module or PCM—determines that the heated oxygen sensor (HO2S) 1 heater current is higher or lower than the ideal amp for
P0134: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)
P0134: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)The Bank 1 portion of the code refers to the side of the engine with the number one cylinder. Sensor 1 refers to the upstream O2 sensor.