Error code

OBD2 P0426

OBD2P0426
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Catalyst Temperature Sensor Range/Performance.

Severity

moderateCan be driven, but should be addressed soon to prevent further issues.

Summary

P0426 indicates a problem with the catalytic converter temperature sensor on Bank 1, which measures the temperature of the catalytic materials. This sensor is crucial for monitoring the efficiency and performance of the emission control system.

Symptoms

  • Illuminated warning light
  • Increased fuel consumption
  • Poor engine idle quality or stalling at low speeds
  • Engine power losses at various speeds and loads

Common Causes

  • Damaged, burnt, shorted, corroded, or disconnected wiring or electrical connectors
  • Defective catalytic converter temperature sensor
  • Use of a substandard aftermarket sensor
  • Fractured or cracked catalytic converter core due to mechanical damage

Diagnosis

  1. Inspect all relevant wiring for signs of damage or corrosion and replace as needed.
  2. Verify that the correct sensor is installed on the vehicle.
  3. Check if both upstream and downstream oxygen sensors are functioning properly.

Fixes

  • Replace damaged wiring, verify correct sensor installation, and check oxygen sensors.— $200 to $1000

FAQ

What does P0426 mean?

P0426 indicates a problem with the catalytic converter temperature sensor on Bank 1, which is crucial for monitoring the efficiency of the emission control system.

How serious is P0426?

Moderate severity. It should be addressed soon to prevent further issues and potential damage to exhaust components.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

More OBD2 codes

All OBD2 codes →Search more codes →