P042BCatalyst Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2
Generic (OBD-II) interpretation in the TuningBot DTC database.
P · PowertrainEmissionsOBD2
What P042B means
P042B
Catalyst Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2
Generic · emissions
Data confidence85%
The control module judged the Catalyst Temperature signal implausible: it stayed inside electrical limits but did not match the value expected for the current operating conditions.
Symptoms
MIL illuminated
Possible smell of unburnt fuel or reduced performance in severe cases
Possible causes
Aged or damaged catalytic converter
Downstream oxygen sensor fault giving a wrong efficiency reading
Exhaust leak
Misfire or mixture fault overloading the catalyst
Recommended checks
Compare upstream and downstream oxygen sensor signals
Check for exhaust leaks
Check for stored misfire or mixture codes first
Verify catalyst temperature plausibility where available
Powertrain: engine, transmission and driveline systems.
0
Generic SAE-standard code: same meaning on every make.
42B
Specific fault index within the subsystem.
Frequently asked questions about P042B
What does P042B mean?
Catalyst Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2. The control module judged the Catalyst Temperature signal implausible: it stayed inside electrical limits but did not match the value expected for the current operating conditions.
Is P042B generic or manufacturer-specific?
P042B is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P042B at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
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