O2 sensor discrepancy
Thread Starter
TECH Resident
Joined: Sep 2019
Posts: 825
Likes: 263
From: Melbourne, Australia
O2 sensor discrepancy Key on engine off bank 2 sensor 1 450mv bank 1 sensor 1 1275mv
Start the car and both do as expected until about the 15min mark the b1s1 drops to 4mv and stays there so b1 starts adding fuel +50%
New o2s, checked fuel pressure, spark, grounds, ohmed out wiring
Any ideas
????????
Start the car and both do as expected until about the 15min mark the b1s1 drops to 4mv and stays there so b1 starts adding fuel +50%
New o2s, checked fuel pressure, spark, grounds, ohmed out wiring
Any ideas
????????
Thread Starter
TECH Resident
Joined: Sep 2019
Posts: 825
Likes: 263
From: Melbourne, Australia
Thread Starter
TECH Resident
Joined: Sep 2019
Posts: 825
Likes: 263
From: Melbourne, Australia
Swapped o2s over ,no change
Checked A few more things today, went for a drive and as soon as it went into open loop same thing happened except now it’s bank 1 , it’s randomly swapped banks gggrrrr
Checked A few more things today, went for a drive and as soon as it went into open loop same thing happened except now it’s bank 1 , it’s randomly swapped banks gggrrrr
You said it was bank 1 to start with. Are you getting confused, or did you mistype?
Thread Starter
TECH Resident
Joined: Sep 2019
Posts: 825
Likes: 263
From: Melbourne, Australia
Sorry I’ll start again
initially b2 sensor 1 will start adding 50% more fuel once it goes into closed loop with bank 1 sensor 1 normal
today bank 1 sensor 1 started to add 50% more fuel in closed loop with bank 2 sensor 1 normal
so the problem swapped banks
in between drives I fixed a broken wire going to the alternator and put a new fuel hose from fuel rail to regulator
At the moment I’m ohming all wires from o2s to ecu and all are good, I just have to test ignition voltage wires to o2s
i have the service/repair manual for the car and it says , engine off ignition on if I get 1265mv I have short to ignition, bank 2 s1 shows 1265mv but when I ohmed the wires it showed good Mayb it does if shorted and I’m testing wrong
i can rule out ignition and fuelling as an issue due to when I command open loop the car pulls hard
The bank confusion came from the service repair manual showing conflicting side
initially b2 sensor 1 will start adding 50% more fuel once it goes into closed loop with bank 1 sensor 1 normal
today bank 1 sensor 1 started to add 50% more fuel in closed loop with bank 2 sensor 1 normal
so the problem swapped banks
in between drives I fixed a broken wire going to the alternator and put a new fuel hose from fuel rail to regulator
At the moment I’m ohming all wires from o2s to ecu and all are good, I just have to test ignition voltage wires to o2s
i have the service/repair manual for the car and it says , engine off ignition on if I get 1265mv I have short to ignition, bank 2 s1 shows 1265mv but when I ohmed the wires it showed good Mayb it does if shorted and I’m testing wrong
i can rule out ignition and fuelling as an issue due to when I command open loop the car pulls hard
The bank confusion came from the service repair manual showing conflicting side
