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Is there a particular fuse to check for check engine light staying on?

Tiny
TOM SINGO
  • MEMBER
  • 1999 VOLKSWAGEN EUROVAN
  • 80,000 MILES
The wiring got wet on my VR6 engine. After I sprayed with PB Blaster it started but with alot of misfires. I waited until it was running smoother and started down the road with an occaisional miss. The check engine light came on (as expected) flashed a few times and stayed on. In a few miles it was running fine but the light never went out. The next day I took it to get the code out of it and see why it didn't go out. The gentleman at Auto Zone said he couldn't get any info out of it which indicated to him it was a blown fuse. Could you tell me what fuse would have to do with the Check Engine light staying on and not allowing info to be retrieved?
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Wednesday, October 19th, 2011 AT 12:18 AM

5 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It's possible that you may have damaged the computer with the pb blaster. But check fuses 1-18-117 in underhood fuse panel and fuse 102 behind lh dash. Also check for a poor ground wire from battery as the pb stuff may have gotten between fhe end of cable.
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Wednesday, October 19th, 2011 AT 12:49 AM
Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
What happened was when you washed/PB blasted the engine the ignition coil got saturated in moisture and caused a mis-fire.

The reason why the guy at autozone could not scan your vehicle was most likely because he was using a cheap generic scanner that cannot scan european vehicles.
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Tuesday, October 25th, 2011 AT 10:03 PM
Tiny
VWSCOTT
  • MEMBER
  • 66 POSTS
Stay away from the zone! They are people that couldn't cut it anywhere else. Any that i've made contact with misdiagnose and try to sell anything to make a buck. Autozone and vw/audi do not go together very well.
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Saturday, July 7th, 2012 AT 1:16 AM
Tiny
VWSCOTT
  • MEMBER
  • 66 POSTS
Also if it's still a problem i'd seperate the suspected connector(s) and use a brake cleaner to wash the pb residue off, it may cause resistance and thus, the cel is on. Do this for the connector side but be careful doing it to the ecm.
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Saturday, July 7th, 2012 AT 1:19 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Tom Singo: How is everything? Were you able to get the CEL to go out? Were the suggestions here useful?
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Sunday, July 29th, 2012 AT 11:46 PM

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