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P2202 — NOx Sensor Circuit Low Bank 1
SeriousAftertreatmentPower derate likely — plan to stop soon
Seen on: Heavy Truck/Diesel
NOx Sensor Circuit Low Bank 1. Common causes: NOx sensor signal low.
Don't risk it — get a diesel tech on the truck.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- NOx sensor signal low
- Short to ground
- failed sensor
First moves (roadside)
- Check signal wire for ground fault
- replace sensor
FAQ
What does P2202 mean?
NOx Sensor Circuit Low Bank 1. Common causes: NOx sensor signal low.
How serious is P2202?
Serious — Power derate likely — plan to stop soon.
What's the most likely cause of P2202?
The most common cause is: NOx sensor signal low. Other possibilities include Short to ground; failed sensor.
Can I keep driving with P2202?
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Throwing this code right now?
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General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.