1.Chevrolet Silverado/Silverado 1500 O2 sensor

Factory Part Number
Upstream(Front) Oxygen Sensor part No.: 12658134 (6.2L V8, common to 2024 models)
Downstream(Rear) Oxygen Sensor part No.: 12658135 (Diesel version uses part No. 12768904)
​Defender Oxygen Sensor Fault Codes & Symptom Signs
P0420: Catalytic converter inefficiency (carbon buildup on rear oxygen sensor or sintered three-way catalytic converter)
P2270: Rear Oxygen Sensor Signal Sticky (Fuel Sulfur Pollution or EGR System Malfunction)
​What causes & How to repair
Sensor overheating when towing heavy loads (max. towing force 4500kg)
Sensor sulfide poisoning due to use of ethanol gasoline
How much oxygen sensor cost to replace？
Genuine sensors: 300-600 (150-250 for labor)
OEM parts (e.g. Bosch): 180-350

2.Chevrolet Equinox O2 sensor

Original part number
Upstream(Front) Oxygen Sensor part No.：​234-4678​（1.5T）
Downstream(Rear) Oxygen Sensor part No.：234-4679
​Defender Oxygen Sensor Fault Codes & Symptom Signs
P0134: No signal (oxidized plug or broken harness)
P0171: mixture too lean (dirty MAF sensor)
​What causes & How to repair
Short city commutes lead to carbon buildup
Delayed heating due to low winter temperatures
How much oxygen sensor cost to replace？
Genuine sensor: 200-350 (80-120 labor)

3.Chevrolet Corvette O2 sensor

Original part number
Upstream(Front) Oxygen Sensor part No.：​12658140​（6.2L LT2）
Downstream(Rear) Oxygen Sensor part No.：12658141
​Defender Oxygen Sensor Fault Codes & Symptom Signs
P0030/P0050: Abnormal heating circuit (shorted wiring harness or faulty ECU power supply)
P2096: Excessively lean mixture (exhaust system leak)
​What causes & How to repair
High temperatures after track driving cause ceramic components to crack
Modified exhaust system interferes with sensor signals
How much oxygen sensor cost to replace？
Genuine sensors: 500-900 (200-400 for labor)

4.Chevrolet Malibu O2 sensor

Original part number
Upstream(Front) Oxygen Sensor part No.：​234-4680​（1.5T/2.0T engines）
Downstream(Rear) Oxygen Sensor part No.：234-4681
​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0130：Signals don't make sense (sensor poisoning or fuel dilution)
​P2297：Fuel pressure contradicts oxygen signal (high pressure fuel pump failure)
​What causes & How to repair
Carbon buildup due to prolonged low-speed driving
Excessive use of fuel additives triggers signal drift
How much oxygen sensor cost to replace？
Genuine sensors: 180-300 (50-100 for labor)

5.Chevrolet Trailblazer/Trax O2 sensor

Original part number
Trailblazer Upstream(Front) Oxygen Sensor part No.：​234-4682​（1.3T engine）
Trax Downstream(Rear) Oxygen Sensor part No.：234-4683
​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0135：Heating circuit failure (wiring harness deterioration)
​P0172：Excessive mixture (faulty fuel pressure sensor)
​What causes & How to repair
Small-displacement turbo models overheat after rapid acceleration
Abnormal voltage caused by insufficient fuel supply from fuel pump
How much oxygen sensor cost to replace？
Genuine sensors: 150-250 (50-80 for labor)

6.Tahoe/Suburban O2 sensor

Original part number
Tahoe Upstream(Front) Oxygen Sensor part No.：​12768905​（5.3L V8 engine）
Suburban Downstream(Rear) Oxygen Sensor part No.：12768906
​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0037/P0057：Abnormal heating circuit voltage (ECU module failure)
​P2271：Signal sticking low voltage (DPF system linkage fault in diesel version)
​What causes & How to repair
Long distance towing of RVs results in constant high sensor loads
Off-road mud and water erode sensor interface
How much oxygen sensor cost to replace？
Genuine sensors: 400-800 (200-350 for labor)

Generic Repair Recommendations
Diagnostic Prioritization:
Check the wiring harness and plug (40% of the failure rate), use a multimeter to detect the supply voltage (standard 0.45V ± 0.1V)
Carbon cleaning can try ferric chloride solution soak (cost 30-50), ineffective replacement
Accessories strategy:
Original parts adaptability is the best (through the GM SPO system to verify the VIN)
Sub-factory recommended ACDelco/Bosch brand, cost-effective
Cost optimization:
Purchase the sensor by yourself and then entrust the third party to repair, saving 30%-50% of labor costs
Data Source and Expansion Recommendations
The above information is synthesized from General Technical Bulletin (TSB 24-NA-015), repair cases and third-party platforms (RepairPal).Real-time parts prices are available through GM Parts Now, and fault code analysis can be found in the Tech2 diagnostic tool data stream.

Provide for Chevrolet Silverado\Silverado 1500\Equinox\Corvette\Malibu\Trailblazer\Trax\Tahoe\Suburban good price O2 sensor OEM repair carparts and auto replacement accessories oxygen sensor