All Things Mk5 > How to Guides / Troubleshooting

EPC Light and a p0221 for good luck (SOLVED)

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phantom1004:
Yeap, has been happening on and off randomly since i brought the car, saw a lot of posts about the new wiring loom so i thought i would order it, but before i did i wanted to see what i was getting myself into, and behold an already installed Replacement wiring harness, i checked all of the connections (soldered o.O) and checked with a multi meter and its perfect,i neatened it up a bit and wrapped it again but alas the problem persists, if its still happening after the wiring harness install what on earth could it be!

Many thanks in advanced

06 MKV GTI

phantom1004:
Update, it only used to happen when driving and at no set speed, drove to work fine but at lunch when i started the car it gave epc, restarting the car cleared it after 500m but it happened again when leaving work when i start the car, i'd love to hear your ideas as im dreadding taking it to a dealer... my pockets arnt THAT deep

doylebros:
This is worth a read
http://wiki.ross-tech.com/wiki/index.php/16605/P0221/000545

And a watch

https://m.youtube.com/watch?v=fdLA5pXUkk4

phantom1004:
Funny you should mention them 2 things, hooked into vagcom i tracked a graph for a 2 hour drive and no funny buisness, however no epc light, i recently redid a TBA and still no change, planning on taking out the throttle body this weekend and see if an inspection will shine a light aka oil/moisture ect, only other thing i can think of is checking the connectors going into the ECU and making sure they are nice and shiney

Edit: now i think about it the first times i got the error i also got a dv valve fault code that i replaced a while ago, was strange both things would trigger at the same milage marker

doylebros:
One of those codes was possibly an old code.
Start from scratch and do all the simple things well and you'll track it down.

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