Here's a down and dirty diagnosis of an oxygen sensor. Sometimes it's just this simple, but do be thorough and check everything I talked about so you get your diagnosis correct.
Careful. It's easy to burn yourself working around hot exhaust, especially catalytic converters.
Here, I'm working on a 2018 Chevy Equinox, but these principles of diagnosis using live sensor data will work on any car or truck so long as it's not running air fuel ratio sensors. Using my technique to put the oxygen sensor in loose to check for a clogged catalytic converter will work on an air fuel ratio system.
A lot of scan tools use the abbreviation HO2S so you can use that to find it on your live data. It'll also say bank 1 sensor 1 or bank 1 sensor 2 for the upstream and Downstream oxygen sensors or it'll say bank 2 sensor 1 or bank 2 sensor 2 for the 2nd bank of your engine also talking about upstream and Downstream oxygen sensors. Without figuring this out, you won't know which oxygen sensor the code and live data are talking about.
#HO2S is how your oxygen sensors will often be abbreviated or your scan tool's live data. HO2S heater circuit testing is how you can check the heater circuit if you have a different P code than I did. P0132 has to do with the sensing side of the circuit. #OxygenSensor
Related codes which may come up:
DTC P0131
HO2S Circuit Low Voltage Sensor 1 - this will show up on live sensor data sometimes as a voltage which is stuck lean. This is highly unusual.
DTC P0132
HO2S Circuit High Voltage Sensor 1 - the code I had today, but loosening the oxygen sensor to see if the catalytic converter was clogged also set P0137.
DTC P015A
HO2S Delayed Response Rich to Lean Sensor 1 - an unusual code, but from other makes and models, it's usually an oxygen sensor which is experiencing stage 2 of o2 sensor death as viewed here: [ Ссылка ]
DTC P015B
HO2S Delayed Response Lean to Rich Sensor 1 - an unusual code, but from other makes and models, it's usually an oxygen sensor which is experiencing stage 2 of o2 sensor death as viewed here: [ Ссылка ]
DTC P223C
HO2S Pump Current Control Performance Bank 1 Sensor 1
DTC P223E
HO2S Reference Resistance Out of Range Bank 1 Sensor 1 - this is where the PCM detects that the resistance of the sensing circuit is out of spec.
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#OxygenSensor #OxygenSensorDiagnosis
