O2 sensor Needs replaced
Le Mans Master
Joined: Sep 2014
Posts: 5,278
Likes: 539
From: Kelowna BC
Bank 1 = drivers side
Bank 2 = passenger side
Sensor 1 is directly after exhaust manifolds/headers to maintain proper A/F ratio
Sensor 2 is after cats to confirm cat is working correctly
So yours is the drivers side sensor plugged in after the cat. Keep in mind the wiring crosses over, don't get them mixed up. Most people running aftermarket cats/headers/no cats have the secondary O2 sensors "tuned out".
Bank 2 = passenger side
Sensor 1 is directly after exhaust manifolds/headers to maintain proper A/F ratio
Sensor 2 is after cats to confirm cat is working correctly
So yours is the drivers side sensor plugged in after the cat. Keep in mind the wiring crosses over, don't get them mixed up. Most people running aftermarket cats/headers/no cats have the secondary O2 sensors "tuned out".
Thread Starter
Intermediate
Joined: Jul 2003
Posts: 28
Likes: 0
From: Lenexa KS
Bank 1 = drivers side
Bank 2 = passenger side
Sensor 1 is directly after exhaust manifolds/headers to maintain proper A/F ratio
Sensor 2 is after cats to confirm cat is working correctly
So yours is the drivers side sensor plugged in after the cat. Keep in mind the wiring crosses over, don't get them mixed up. Most people running aftermarket cats/headers/no cats have the secondary O2 sensors "tuned out".
Bank 2 = passenger side
Sensor 1 is directly after exhaust manifolds/headers to maintain proper A/F ratio
Sensor 2 is after cats to confirm cat is working correctly
So yours is the drivers side sensor plugged in after the cat. Keep in mind the wiring crosses over, don't get them mixed up. Most people running aftermarket cats/headers/no cats have the secondary O2 sensors "tuned out".
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Please post the DTCs that sent you into the O2 sensor direction. Remember,,,, O2 sensors have different failure modes:
- Defective Sensing element
- Defective/non working heaters.
- Defective/Damaged wiring and or connectors
- PCM reference voltage not working
Before you throw in new sensors, I strongly recommend obtaining a VOLT/OHM meter and making sure that you have proper heater voltages at the fuse test points and proper ground.
Here is the circuit that you will be dealing with:
Notice that the voltage to the circuit is ONLY SUPPLIED when the IGNITION SWITCH is ON. Make sure that there is full battery foltage available at that fuse.
- Defective Sensing element
- Defective/non working heaters.
- Defective/Damaged wiring and or connectors
- PCM reference voltage not working
Before you throw in new sensors, I strongly recommend obtaining a VOLT/OHM meter and making sure that you have proper heater voltages at the fuse test points and proper ground.
Here is the circuit that you will be dealing with:
Notice that the voltage to the circuit is ONLY SUPPLIED when the IGNITION SWITCH is ON. Make sure that there is full battery foltage available at that fuse.
