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Old 09-09-2010, 05:08 PM   #1
007WRX
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76 Datsun ZZZZZZZ

Default 98 Forester issues - CEL codes

Hey guys my forester has been stumbling and stalling qiute a bit, sometimes it doesnt even want to start and others you won't be able to tell there is a problem.

Its throwing a starter circuit code, p0102 MAF low voltage, and a rear 02 sensor code.

I swapped out mafs and the problem wasn't fixed. My questions is it possible for an 02 sensor thats messed up to make the car sometimes not run? Could it be a grounding issue?

If anyone has some insight or advice, please let me know.
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Old 09-13-2010, 04:51 PM   #2
007WRX
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No one has any hints? Is it really possible for an 02 sensor to cause the car to stall out and not want to fire up after for a while?
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Old 09-14-2010, 12:53 AM   #3
Inane Cathode
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Hmm, sounds like it could be a voltage thing, if those problems are connected. Did you say it still threw the maf code after you switched maf's?

Something to try is a voltage drop test, put your meter (if you have a meter, that is) on the engine block, and the negative battery post (the post, not the clamp or any other battery wires). Set the meter to volts, and have someone start the car while you watch the meter. There shouldnt really be any voltage shown on the meter, nothing more than half a volt or so. This is a way to see if any voltage is 'trying' to leave the block, but can't for some reason.

Have you checked charging voltages, and given the motor a good once around to check for corrosion on connectors, and specifically ground points?

Post back up if you're still having issues, i can look at my diagrams and see if those sensors share grounds (i know the o2 sensor doesnt, that's a weird one but its one of the more 'sensitive' codes, i'd ignore it for now)
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Old 10-21-2010, 04:59 PM   #4
007WRX
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I got my hands on a set of new/used 02 sensors that I still need to put in, so I'll try that. You think it could be a grounding issue?

The previous owner used it as a ski vehicle, so salts and such probably couldve gotten in there.

The maf I tried wasn't brand new, but it was a friends that he said worked. The likely hood of using two messed up mafs is pretty low.

Last edited by 007WRX; 10-21-2010 at 05:05 PM.
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Old 10-21-2010, 05:15 PM   #5
007WRX
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Also, I got stuck so I unlplugged the maf to put it in limp mode, and it fired right up.
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