Catalyst Temperature Sensor Range/Performance (Bank 2)
The P0436 code means the vehicle's onboard diagnostic system has detected: Catalyst Temperature Sensor Range/Performance (Bank 2). This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $80 - $300 (parts and labor)
Reads enhanced codes and shows real-time O2 sensor data. Verify the cat is actually bad before dropping $1,000+ on a replacement.
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Common Symptoms
- Check Engine Light illuminated
- No drivability symptoms
- Bank 2 catalyst monitoring disabled
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Degraded Bank 2 catalyst temperature sensor Very High
- Carbon buildup on the Bank 2 sensor tip High
- Intermittent wiring issue on Bank 2 sensor circuit Moderate
- Exhaust leak near the Bank 2 sensor Low
Step-by-Step Diagnostic Procedure
-
Monitor Bank 2 catalyst temperature during warm-up and compare to expected values
-
Compare sensor reading to an infrared thermometer measurement at the exhaust pipe
-
Inspect the sensor for heavy soot buildup
-
Check for exhaust leaks near the sensor
-
Replace the sensor if response time is slow or readings do not track actual temperature
Frequently Asked Questions
Can I drive with code P0436?
Yes. The sensor performance issue does not affect engine operation. ECM disables Bank 2 catalyst temperature monitoring until repaired.
Is P0436 the Bank 2 version of P0426?
Yes. P0426 is Bank 1 catalyst temperature sensor range/performance and P0436 is the equivalent for Bank 2.
How long does the catalyst temperature sensor last?
Catalyst temperature sensors typically last 100,000-150,000 miles. Exposure to extreme heat and exhaust gases gradually degrades the sensing element over time.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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