Redundant Exhaust Temperature Sensor 2 Performance
This code indicates a performance issue with the secondary exhaust temperature sensor.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
Your vehicle has a system to monitor exhaust temperature that isn't working right, likely due to the second sensor giving bad readings or the wiring to it being faulty.
What the computer is actually seeing
The engine control module (ECM) expects to see consistent temperature readings from the secondary exhaust temperature sensor. If it detects readings that are out of range or inconsistent with the primary sensor, it sets this code.
What a healthy reading looks like
The secondary exhaust temperature sensor should read between 150°F to 850°F (65°C to 454°C) under normal operation. A large deviation from the primary sensor readings (more than 50°F or 28°C) can trigger this code.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the wiring and connector for the secondary exhaust temperature sensor. Look for damage or corrosion. If everything looks good, proceed to step 2.
- 2Measure the voltage at the secondary exhaust temperature sensor. It should vary with exhaust temperature; expect 0.5V at cold to 4.5V at operating temp. If it's out of range, replace the sensor.
- 3Check the primary exhaust temperature sensor's readings. If both sensors are faulty, the issue could be in the ECU or wiring; further tests may be needed.
Common causes
- Faulty secondary exhaust temperature sensor
- Corroded or damaged wiring connectors
- Exhaust leaks affecting sensor readings
- Failed PCM
- Temperature sensor installed in the wrong location
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but you should repair it soon to avoid potential emissions issues.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will return.
Why does this code pair with other exhaust temperature codes?
These codes all monitor exhaust temperature and can trigger together if there's a common fault.
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