Multi-code OBD2 diagnosis
Enter all the codes your scanner showed, not just the first one. We give you the overall severity, whether you can keep driving, the order in which to check them and how they relate to each other.
Summary
- Overall severity
- Medium
- Can I keep driving?
- Yes, no immediate risk
- Estimated cost
- $80 to $350
- Codes analyzed
- 1 of 1
The order below is the recommended one: first the codes that can cause the others. After each repair, clear the codes and check which ones come back.
Order of inspection
P1166 Air Fuel Ratio Sensor Heater Electrical Circuit (Honda, Sensor 1) Medium
On Honda and Acura, the P1166 code points to an electrical fault in the heater circuit of the air fuel ratio sensor (sensor 1). Fuel use runs higher after a cold start. A bad heater, fuse, relay or burned connector is the usual cause.