O2 reader code
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Joined: Sep 2020
Posts: 5
O2 reader code
I went to the shop and the code was p0102 which is a short circuit in my MAF can someone help. When my headlights engage my car starts running really terrible
Last edited by Armando Flake; Sep 8, 2020 at 07:59 AM.
Joined: Feb 2008
Posts: 6,452
Having never heard of that code before, I googled it to see what it was. Oddly enough what comes back for p0201 doesn't seem to match up with what you've noted about the MAF circuit:
"Cylinder 1 Injector Circuit Malfunction"
In terms of the headlights causing engine issues, I've got 2 things I'd initially think about:
1- What kind of amperage draw are you seeing headlights off vs on, what is the voltage between the two states? Wondering if maybe a battery or alternator could be weak / failing.
2- Id look into the ground path for the headlights and engine. Wondering if a poor / corroded ground somewhere is causing issues.
Has the car been wrecked or flooded before this happened? Any other changes right when the issue started?
"Cylinder 1 Injector Circuit Malfunction"
In terms of the headlights causing engine issues, I've got 2 things I'd initially think about:
1- What kind of amperage draw are you seeing headlights off vs on, what is the voltage between the two states? Wondering if maybe a battery or alternator could be weak / failing.
2- Id look into the ground path for the headlights and engine. Wondering if a poor / corroded ground somewhere is causing issues.
Has the car been wrecked or flooded before this happened? Any other changes right when the issue started?
Thread Starter
|
Joined: Sep 2020
Posts: 5
Having never heard of that code before, I googled it to see what it was. Oddly enough what comes back for p0201 doesn't seem to match up with what you've noted about the MAF circuit:
"Cylinder 1 Injector Circuit Malfunction"
In terms of the headlights causing engine issues, I've got 2 things I'd initially think about:
1- What kind of amperage draw are you seeing headlights off vs on, what is the voltage between the two states? Wondering if maybe a battery or alternator could be weak / failing.
2- Id look into the ground path for the headlights and engine. Wondering if a poor / corroded ground somewhere is causing issues.
Has the car been wrecked or flooded before this happened? Any other changes right when the issue started?
"Cylinder 1 Injector Circuit Malfunction"
In terms of the headlights causing engine issues, I've got 2 things I'd initially think about:
1- What kind of amperage draw are you seeing headlights off vs on, what is the voltage between the two states? Wondering if maybe a battery or alternator could be weak / failing.
2- Id look into the ground path for the headlights and engine. Wondering if a poor / corroded ground somewhere is causing issues.
Has the car been wrecked or flooded before this happened? Any other changes right when the issue started?
Joined: Feb 2008
Posts: 6,452
That makes more sense. I still think the outcome is the same- id look into the two places above:
-Voltage / amperage changes headlights on vs off. Also load testing the battery and alternator. Id look to see if voltage was crashing when you turn the lights on - say from 14 to 8 or something crazy. Id also be curious if current draw seemed reasonable, although you'd likely have other issues if it wasn't (blown fuses, burnt wiring, etc).
-Making sure the grounds are OK- MAF ground, pcm ground, headlight ground, ICM ground. Its possible to have good voltage/ amperage going in, but to have reduced performance of the piece of equipment because it doesn't have a clean path back to battery. Perhaps there's only a small area of ground contact left uncorroded that's being shared by the headlights and a piece of engine control equipment (perhaps unintentionally) that can't handle the return of both items at the same time.
-Voltage / amperage changes headlights on vs off. Also load testing the battery and alternator. Id look to see if voltage was crashing when you turn the lights on - say from 14 to 8 or something crazy. Id also be curious if current draw seemed reasonable, although you'd likely have other issues if it wasn't (blown fuses, burnt wiring, etc).
-Making sure the grounds are OK- MAF ground, pcm ground, headlight ground, ICM ground. Its possible to have good voltage/ amperage going in, but to have reduced performance of the piece of equipment because it doesn't have a clean path back to battery. Perhaps there's only a small area of ground contact left uncorroded that's being shared by the headlights and a piece of engine control equipment (perhaps unintentionally) that can't handle the return of both items at the same time.
Last edited by bumpin96monte; Sep 8, 2020 at 09:27 AM.
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