← Back to list

2002 Honda CR-V P1166 and P1167 O2 Sensor Heater Circuit Fault Diagnosis

Model: 2002 Honda CRV Fault Code: P1166 Posted: 2008-12-11 17:34

Hello, I'm experiencing trouble codes P1166 and P1167 on my 2002 Honda CR-V. I used the All-Data program to retrieve diagnostic information. The first step was to clear the codes to determine if they were intermittent or persistent. After clearing, the P1167 disappeared — indicating it was intermittent — but the P1166 returned and the check engine light has come back on. I've performed several All-Data tests, though accessing the ECU wiring for backprobing proved difficult. Based on my diagnostic results, I suspect the #1 oxygen (O2) sensor is faulty. This part can be expensive, so I'm seeking confirmation before replacing it. Can anyone confirm whether the O2 sensor heater circuit is typically the root cause of these codes? Thanks for any insights. Note: P1166 and P1167 refer to oxygen sensor heater circuit faults in the 2002 Honda CR-V, which are commonly associated with failing O2 sensors.

Related fault codes
P1166
Comments (6)
Anonymous 2008-12-11 20:22

Yes, oxygen sensor heater circuits fail frequently and are a common issue on vehicles like this.

Anonymous 2008-12-12 18:18

I'm looking for more confidence before replacing the O2 sensor — does anyone have a definitive answer or test procedure?

Anonymous 2008-12-12 19:17

If you're unsure, take it to a qualified mechanic who specializes in emissions systems. The P1166 and P1167 codes specifically relate to the oxygen sensor heater circuit. Use an ohmmeter to test the resistance of the heater element in the sensor — it will likely show an open circuit. While some codes are common failure patterns, O2 sensor heater faults occur in about 98% of cases due to a failing sensor. It's not uncommon for imported vehicles like this to have both heater circuits fail simultaneously.

Anonymous 2008-12-13 18:13

I apologize — that first comment was poorly worded. I work on domestic vehicles, not imports, so I don't have extensive experience with foreign models. My point stands: O2 sensor issues are common and often stem from heater circuit failures.

Anonymous 2008-12-13 21:01

Mechanical components — whether imported or domestic — follow the same principles; it's all about proper diagnosis and repair.

Anonymous 2009-07-10 12:13

Interesting point — I'm going to check this out myself. Thanks for the detailed explanation, especially on testing procedures!