OBD fault code library
Look up any P or U code to see what it means, what causes it, the parts involved and how it gets fixed.
Free on OBD DashX
Looking for real-world repair data?
OBD DashX shows which problems come with each code, how often they show up in other vehicles, and how to fix them — step by step.
- Real-world fix data
- How often it happens
- Step-by-step repairs
Fault codes
P2222
NOx Sensor Heater Sense Circuit Range/Performance Bank2
Auxiliary Emissions Control
High severity
P2231
O2 Sensor Signal Circuit Shorted to Heater Circuit Bank1 Sensor 1
Fuel and Air Metering
Medium severity
P2233
O2 Sensor Signal Circuit Shorted to Heater Circuit Bank1 Sensor 3
Fuel and Air Metering
Medium severity
P2236
O2 Sensor Signal Circuit Shorted to Heater Circuit Bank2 Sensor 3
Fuel and Air Metering
Medium severity
P2237
O2 Sensor Positive Current Ctrl Circuit/Open Bank1 Sensor 1
Fuel and Air Metering
Medium severity
Scan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.