What P0135 Means for Your 2020 Camaro
Your 2020 Chevrolet Camaro has logged a P0135 diagnostic trouble code, indicating a malfunction in the oxygen sensor heater circuit for Bank 1, Sensor 1. The 2020 Camaro offered multiple engine options: the 2.0L turbocharged four-cylinder (275 hp), 3.6L V6 (335 hp), 6.2L LT1 V8 (455 hp), and the supercharged 6.2L LT4 in the ZL1 (650 hp).
On V8 and V6 models, Bank 1 is the driver's side cylinder bank (passenger side on the V6). On the turbo-four, there's a single bank. Sensor 1 is the upstream O2 sensor before the catalytic converter. The heater element brings the sensor to operating temperature quickly for accurate fuel control.
Symptoms You May Experience
- Check engine light on (steady)
- Slightly reduced fuel economy
- Rough idle when cold
- Longer warm-up before smooth operation
- Failed emissions test
Performance-oriented drivers may notice the car doesn't feel quite right during cold start, but once warmed up, your Camaro should perform normally.
Common Causes on the 2020 Camaro
O2 Sensor Heater Element Wear
The Camaro's high-performance engines generate significant exhaust heat. The 6.2L V8s especially run hot, accelerating heater element wear. Spirited driving produces thermal cycling that stresses the sensor.
Connector or Wiring Damage
Heat from the Camaro's exhaust system can damage sensor wiring over time. The V8 models have particularly hot exhaust manifolds that can bake nearby wiring insulation.
Aftermarket Exhaust Effects
If your Camaro has headers, cat-back exhaust, or other modifications, the O2 sensor location or heat exposure may differ from stock. Aftermarket headers often position sensors closer to extreme heat.
Blown Fuse
A blown O2 heater fuse can trigger P0135. This is a quick, free check before assuming sensor failure.
Warranty Considerations
Check your 2020 Camaro's warranty status:
- Bumper-to-Bumper: 3 years/36,000 miles (likely expired)
- Powertrain: 5 years/60,000 miles
- Federal Emissions: 8 years/80,000 miles for certain components
Contact your Chevrolet dealer to verify emissions warranty coverage before paying for repairs.
Diagnosis Steps
- Check warranty—Could save money
- Identify your engine—Determines sensor location
- Check fuse—Free and quick
- Inspect for modifications—Headers/exhaust may affect diagnosis
- Test heater resistance—Should be 2-30 ohms
- Verify voltage supply—Battery voltage with key on
Repair Costs
Professional Repair
- Dealer (V8 models): $200-$400
- Dealer (turbo-four/V6): $180-$320
- Independent shop: $150-$300
DIY Approach
- OEM AC Delco sensor: $80-$150
- Quality aftermarket: $60-$120
- O2 sensor socket: $15-$25
DIY Replacement Tips
Sensor access varies dramatically by engine:
- 2.0L Turbo: Accessible from above
- 3.6L V6: May require removing engine cover for access
- 6.2L V8: Limited space, may need to work from below
- ZL1: Supercharger complicates access significantly
- Work with completely cold engine
- Apply penetrating oil overnight
- Disconnect electrical connector
- Use O2 sensor socket with wire slot
- May need extensions and universal joints
- Apply anti-seize to new sensor threads
- Torque to spec (30-40 ft-lbs)
- Clear codes and test drive
Modified Camaros
If your Camaro has aftermarket headers or exhaust:
- Verify sensor location matches stock procedures
- Check for exhaust leaks that may affect readings
- Ensure sensor bungs are positioned correctly
- Consider whether modifications void emissions warranty
Performance Driving Impact
P0135 affects cold-start operation, not full-throttle performance. Once warmed up, your Camaro will make full power. However, the rich running condition during warm-up can accelerate catalytic converter wear if left unaddressed long-term.