How to determine which O2 sensor is bad
#1
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How to determine which O2 sensor is bad
The check engine light is on, I checked with a scanner and the code is listed below, it does not tell me which one of the two sensors is bad. How can I determine that, I would appreciate any help
Code: P1166 HO2S11 Heater Circuit Fault.
Engine Info:
2000 Honda Accord EX 4 Cyl
F23A4
Code: P1166 HO2S11 Heater Circuit Fault.
Engine Info:
2000 Honda Accord EX 4 Cyl
F23A4
#4
Yes.
There are some resistance tests that you can do on that sensor to see if the circuit is open. You can download a shop manual from the online manuals link in the DIY section to get the proper procedures.
There are some resistance tests that you can do on that sensor to see if the circuit is open. You can download a shop manual from the online manuals link in the DIY section to get the proper procedures.
#5
Unplug the sensor & look for 2 same-color (black?) wires from the sensor itself. Measure resistance between them. Normally should be 10-40 ohms, but I think you have the ULEV engine so I'm not sure if the preheater is the same wattage.
But normally if a heater fails, it'll go to open-circuit.
If the heater resistance is OK, the next thing is to check for power at those 2 wires coming from the car. One should get battery voltage as soon as the engine's running, the other will be near-ground. The ground side goes thru the ECU, so it may have some resistance to a good body-ground.
But normally if a heater fails, it'll go to open-circuit.
If the heater resistance is OK, the next thing is to check for power at those 2 wires coming from the car. One should get battery voltage as soon as the engine's running, the other will be near-ground. The ground side goes thru the ECU, so it may have some resistance to a good body-ground.
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HORSEPOWERJUNKIE2007
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03-31-2008 04:53 PM