P22F1
Particulate Matter Sensor Heater Performance
The particulate matter (PM) sensor heater on diesel after-DPF systems does not reach or hold the calibrated operating temperature within the expected time. Without proper heating the PM sensor cannot be regenerated and read correctly.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- PM sensor agingCommon
- Increased heater resistancePossible
Parts involved
- Pm Sensor
- Pm Heater Circuit
P22F1 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.