P1167 on 1996-1999 Honda Civic (DX, LX, EX, Si, HX) — Air/Fuel Ratio Sensor 1 Heater System Malfunction
1 vehicles · 1 makes · $250-$700 repair
Most Reported On
P1167 is an OBD-II diagnostic trouble code meaning “Air/Fuel Ratio Sensor 1 Heater System Malfunction.” A manufacturer-specific code used by Honda and Acura for a fault in the heater circuit of the upstream wideband air/fuel ratio sensor (bank 1, sensor 1). That sensor has to reach operating temperature quickly for the PCM to control the fuel mixture accurately; when the PCM commands the heater on and the circuit's current or resistance stays out of range, it sets this code. Expect the check engine light, possibly slightly reduced fuel economy, and an emissions test failure. Other manufacturers reuse P1167 for unrelated concerns, so confirm the make before diagnosing. This code is most commonly reported on 1996-1999 Honda Civic (DX, LX, EX, Si, HX), with repair costs ranging from $250 to $700.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
P1167 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does P1167 mean?
P1167 stands for "Air/Fuel Ratio Sensor 1 Heater System Malfunction." A manufacturer-specific code used by Honda and Acura for a fault in the heater circuit of the upstream wideband air/fuel ratio sensor (bank 1, sensor 1). That sensor has to reach operating temperature quickly for the PCM to control the fuel mixture accurately; when the PCM commands the heater on and the circuit's current or resistance stays out of range, it sets this code. Expect the check engine light, possibly slightly reduced fuel economy, and an emissions test failure. Other manufacturers reuse P1167 for unrelated concerns, so confirm the make before diagnosing.
What are the most common causes of P1167?
The most common causes of P1167 are: Failed air/fuel ratio sensor heater element (sensor replacement), Blown air/fuel sensor heater fuse, Damaged, melted or chafed sensor wiring near the exhaust, Corroded or loose sensor connector, Open or shorted heater power feed / ground circuit, Poor engine ground causing excessive voltage drop, Faulty PCM heater driver circuit (rare). The specific cause varies by vehicle.
How much does it cost to fix P1167?
Repair costs for P1167 range from $250 to $700, depending on the vehicle and root cause.
Which vehicles are affected by P1167?
Au7o has documented P1167 across 1 vehicle models from 1 manufacturers: Honda.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.