Exhaust Gas Temperature Too High - Bank 1
What does P2428 mean?
The P2428 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Temperature Too High - Bank 1. This is a critical severity code.
Common Symptoms
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Burning smell from engine or exhaust area
- Catalytic converter glowing red (visible at night)
- Engine performance severely degraded
Probable Causes (Ranked by Likelihood)
- Engine running extremely rich causing catalyst overheating Very High
- Persistent misfire dumping unburned fuel into exhaust High
- Restricted exhaust causing backpressure Moderate
- Failed exhaust gas temperature sensor reading incorrectly Moderate
Step-by-Step Diagnostic Procedure
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Check for misfire codes that could be causing unburned fuel in exhaust
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Monitor exhaust gas temperature with scan tool
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Inspect exhaust system for restrictions or collapsed pipes
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Check fuel injectors for leaking or stuck-open conditions
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Verify the exhaust gas temperature sensor reading against an infrared thermometer
Frequently Asked Questions
Can I drive with code P2428?
No, stop driving immediately. Excessively high exhaust temperatures can cause catalytic converter meltdown and pose a fire risk.
What causes P2428?
Most commonly a persistent misfire or rich-running condition that sends unburned fuel into the exhaust where it ignites in the catalytic converter.
Is P2428 expensive to fix?
Costs range from $200 to $1500. Fix the root cause (misfire or rich condition) first. The catalytic converter may also need replacement if damaged.