Air-Fuel Ratio Sensor Heater System Malfunction -- Bank 2 Sensor 1 (Honda)
What does P1167 mean?
The P1167 code means the vehicle's onboard diagnostic system has detected: Air-Fuel Ratio Sensor Heater System Malfunction -- Bank 2 Sensor 1 (Honda). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Poor cold-start fuel economy
- Rough idle when cold
- Higher emissions during warmup
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Failed heater element in air-fuel ratio sensor Very High
- Blown sensor heater fuse or relay High
- Damaged wiring to sensor heater circuit Moderate
- Corroded sensor connector Moderate
- PCM heater control driver fault Low
Step-by-Step Diagnostic Procedure
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Check the O2 sensor heater fuse and relay
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Measure heater circuit resistance at the sensor connector -- compare to specification
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Inspect the wiring to the bank 2 sensor 1 heater circuit
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Monitor heater current draw with a scan tool
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Check for voltage supply at the heater circuit connector
Frequently Asked Questions
Can I drive with code P1167?
You can drive short distances. The sensor will eventually warm up from exhaust heat, but the engine will run richer than normal during warmup, increasing fuel consumption.
What causes P1167 on Honda?
A failed internal heater element in the air-fuel ratio sensor is the most common cause. These heaters degrade over time and eventually fail, requiring sensor replacement.
Is P1167 the same as P0155?
They are related. P0155 is the generic OBD-II code for bank 2 sensor 1 heater circuit malfunction. P1167 is Honda's manufacturer-specific version with slightly different detection criteria.