Hello Subie enthusiasts I have quite a few codes that I need help with. Most of them deal with sensors and my car is running very lean it seems to be lacking a lot of power.
P1518 Starter switch circuit low input
P0851 Park/Neutral Switch Input Circuit Low
P1152 HO2S11 Sensor Circuit Range/Performance Low.
Possible causes:
- Faulty HO2S11
- HO2S11 harness is open or shorted
- HO2S11 circuit poor electrical connection
P1153 HO2S11 Sensor Circuit Range/Performance High
P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
Just as a first reaction I don't think you need to go replacing all those sensors. They all have a common thread of being circuit issues. Low system voltage from a weak alternator and battery could be part of your problem.
But, yeah, a little back story and some more car info would be helpful.
First place I look when I have a bunch of electrical codes is the battery, then the alternator. You'd be surprised what a weak battery does to the sensors.
I would start with taking your alternator to your nearest auto parts store and having it tested. Bad alternators do weird things to cars. This could be one of them.
Try disconnecting the battery, pressing the brake for 30", and then carefully making sure the main harness to the ECU, and every connector behind the dash, are all still intact. I wonder if something has been pulled out of place. Don't trust a visual, try pressing the clips together and making sure all the wires are actually in each respective clip. Then reconnect the battery and see what happens. If you happened to pull either power or a ground connection from the motor area, check all that too.
Thanks for the response SD_GR. I did disconnect the battery and contacted the neg and pos battery cables together for quite a while (a shop told me this would discharge and capacitors in the circuits). But I did't hold the brake down while doing this. I'll try your technique tomorrow.
There is a ground wire under the passengers seat that's screwed into the frame. I piggybacked the ground wire fro my amp underneath it. But I don't thing that is the culprit side I drove the car after doing that and all was well.
The ECU harness is the yellow bundle of wires on the drivers side of the trans hump? I didn't even touch those but I'll check. I did see the green connector on the drivers side and connected it but later read that this supposed to be disconnected. I'll recheck everything else AGAIN tomorrow.
The green connectors on the driver's side must NOT be connected or you will get a Christmas tree of CELs and your dash will look like the average VW. Disconnect those.
So I woke up this morning, jumped in the car to take my cat to the vet and the flashing engine light situation was GONE ! I did disconnect the green plug last night. The weird thing is that initially when the issue first surfaced the green plug was never connected. I only connected it because I thought it was supposed to be.
Anyway I hope the problem doesn't turn up again. Just glad it doesn't appear it was something I did during the stereo install.
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