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TuningBot DTC Database · v4.37.15

P0426 Catalyst Temperature Sensor Range/Performance (Bank 1 Sensor 1)

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainEmissionsOBD2

What P0426 means

P0426
Catalyst Temperature Sensor Range/Performance (Bank 1 Sensor 1) Generic · emissions Data confidence 90%

The control module judged the Catalyst Temperature behaviour implausible for the current operating conditions.

Symptoms

  • MIL illuminated
  • Possible smell of unburnt fuel or reduced performance in severe cases

Possible causes

  • Wiring
  • poor connection
  • catalytic converter temperature sensor

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

Related and nearby codes

P04 range
P0400P0401P0402P0403P0404P0405P0406P0407P0408P0409P040AP040BP040CP040DP040EP040FP0410P0411

How to read P0426

P

Powertrain: engine, transmission and driveline systems.

0

Generic SAE-standard code: same meaning on every make.

426

Specific fault index within the subsystem.

Frequently asked questions about P0426

What does P0426 mean?

Catalyst Temperature Sensor Range/Performance (Bank 1 Sensor 1). The control module judged the Catalyst Temperature behaviour implausible for the current operating conditions.

Is P0426 generic or manufacturer-specific?

P0426 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P0426 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.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: Oxygen Sensors (Lambda)

ECU tuningDyno-tested results by model and engine See the results →

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