Share a caseSign in
EmissionsSeverity Medium: diagnose soon

P2202NOx Sensor Circuit Low (Bank 1)

What it means

The NOx sensor (bank 1) signal is too low.

Symptoms

  • Emissions or AdBlue warning light
  • Possibly a countdown to a no-restart condition

Common causes

  • Failed NOx sensor (common)
  • Wiring or connector fault (heat damage)
  • Missing supply or CAN fault to the sensor module
  • Exhaust leak near the sensor

What to check first

  1. Check supply, ground and CAN wiring at the sensor module
  2. Read the NOx sensor values and status bits
  3. Check for exhaust leaks before replacing the sensor
Can I drive with P2202? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

Cases with P2202 (0)

Share yours

No published cases with this code yet.

Colleagues asking about P2202

Ask for help

Stuck on P2202? Describe what you measured and ask the community.

P2202: questions and answers

What does P2202 mean?

P2202: NOx Sensor Circuit Low (Bank 1). The NOx sensor (bank 1) signal is too low.

What are the symptoms of P2202?

Emissions or AdBlue warning light. Possibly a countdown to a no-restart condition.

What causes P2202?

Failed NOx sensor (common). Wiring or connector fault (heat damage). Missing supply or CAN fault to the sensor module. Exhaust leak near the sensor.

How do you diagnose P2202?

1. Check supply, ground and CAN wiring at the sensor module 2. Read the NOx sensor values and status bits 3. Check for exhaust leaks before replacing the sensor

Can I drive with P2202?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.