Wiring loom needs replacing on Peugeot 208 GTI
Wiring loom needs replacing on Peugeot 208 GTI
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Discussion

Reknaw155

Original Poster:

29 posts

101 months

Wednesday 29th November 2017
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Okay guys, along with my seat I have another problem with my car. I was getting two error codes on a diagnostic scanner P0235 and P0238 which basically points to a dodgy turbocharger sensors or something.

The first garage thought it might of been the turbocharger sensors valve but couldn't be too sure. So I've taken it to a Peugeot dealer and they've said it's the wiring loom but it's £800-£900 to replace.

The cars a Peugeot 208 GTi. The warranty are saying it's not covered and trying to get out of paying for my seat (other thread).

Is the price about right, or are they ripping me off big time? Would I be best getting some where else to do it? Also do all brands of cars have their own wiring looms or is it specific to my 208 GTI?

Thanks.

Reknaw155

Original Poster:

29 posts

101 months

Wednesday 29th November 2017
quotequote all
I'm going to ask to see what part of the wiring loom is damaged so I know for sure.

There's one used on eBay that should work? Reckon I just get something like this and pay a mechanic to fit it?

Peace.

Camspeed

4 posts

93 months

Friday 15th December 2017
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Dealers charge so much that often its cheaper to replace a loom rather than find the fault. Based on hourly rates etc.

I would go to an auto electrician for a second opinion.

I have had issues like this before with Peugeot and Mazda dealers. On both occasions an Bosch specialist fixed it for me. One needed a harness plug resoldering and the other needed an earth lead replacing. Both faults found with a multimeter rather than a scanner.

Both showed up as various sensor faults.






StoatInACoat

1,355 posts

202 months

Thursday 21st December 2017
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I have stripped down, removed, repaired and re-installed a wiring loom on a Megane 225 which has an engine bay the looks like an explosion in a spaghetti factory . It is a horrible, messy, tedious job but I would do it again if I was quoted £900 for a new loom. Be 100% sure it is the loom first - replace any suspicious sensors and do as much research as you can about similar faults and their solutions and try all of them.

When you've decided that there really is no hope and it is actually the loom that's at fault you're going to need lots and lots of labelling, patience, a good quality soldering iron and some self-antagonising tape. Have lots of breaks too or your back will give up after a couple of hours.

I wouldn't bother replacing it with a second had one. What I WOULD do before pulling the whole loom apart is break the job into easier stages as follows and test eh car after every stage to save yourself a LOT of work:

First check all your plugs, sensors and anything easy to reach is plugged in properly! It's never this easy but it's worth a try!

Isolate the part of it that is linked to the sensors in question. For example, the Megane has an injector circuit which runs the injectors, coils, various sensors, N75 thing, and a load of other guff but can be more or less separated from the rest of the loom so anything NOT on that circuit can be more or less discounted at this stage. In practice this means any fault on this circuit will trip a "CHECK INJECTION" fault despite being nothing at all to do with the injectors (in my case coil pack wiring) so you may find you have several codes but only one actual fault. Check this circuit for any obvious damage or chaffing particularly where it bends behind or under anything and repair as you go.

When you've figured out what controls what jiggle the wiring/plugs about with the car running and try to trip the fault. If you do, voila, you've found your problem and can attack just that part of the loom.

If you've got to this point you're going to need to start stripping the loom. It'll be wrapped in tape so you're going to need to unwind this but do the loom in sections so you can remember what goes where otherwise you'll get into a mess. Look for physically broken insulation of wires, damaged plugs etc and use a tester to check the resistance of suspect bits of the loom if you can't see anything obvious. You should end up with something like this: (note fag ash everywhere, this was a few hours and about 100 fags into the job)



And if you're REALLY lucky you'll find something like this:



(To complicate matters your car uses a CANBUS system which means that some wires carry different signals at different times but don't worry about that for now!)

If you're not then go back to step one and start checking the rest of the loom.

And that is why your mechanic wants £900 hehe