P2084: Exhaust Gas Temperature Sensor Circuit Range/Performance — Bank 1 Sensor 2
What to do
As P2080, with the note that this is the sensor closest to the filter — the one whose honesty matters most during a regeneration.
What this code means
The second exhaust temperature sensor's reading is implausible — P2080's argument at the downstream position, where the stakes sharpen rather than soften.
Sensor 2 typically sits at or after the particulate filter, and the pair is the measurement: temperature in versus temperature out is how the module watches a regeneration actually proceeding — the corpus's paired-sensor rule from P2182, applied to fire control. A drifted sensor 2 corrupts the differential, so regenerations run blind at the filter itself. The cold-start agreement check convicts the drifter here as everywhere in the family.
Likely causes
Start here
- Sensor drifted out of calibration · moderate
- Faulty exhaust gas temperature sensor · moderate
Less common
- Exhaust heat damage to sensor harness · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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