P2209: NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1 — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1. Basic catalogue definition; diagnostic details have not yet been reviewed.
Affected system: Powertrain
Symptoms
- The engine or emissions indicator may illuminate with little immediate change in driving.
- The exhaust-emissions system may report additional faults when the sensor heater does not operate correctly.
Possible causes
- The NOx sensor heater or its monitoring circuit may be defective.
- A damaged connector, interrupted wiring or a heater supply fault, including a related fuse where fitted, may cause abnormal circuit behavior.
What to check
- Read accompanying NOx and heater codes and identify the correct sensor circuit.
- Inspect accessible heater wiring, pins, power supply and relevant fuse using the vehicle wiring diagram.
- Compare heater-circuit measurements and commanded operation with manufacturer specifications before replacing the assembly.
Also written as: P2209-00, P220900 (some scan tools add the fault-type byte, e.g. -00).