MAP sensor help

MK R BOY

Active Member
Mar 5, 2008
139
3
Hi all

I’m running a couple of fault codes on my LCR and the first port of call is a clean/replace of the MAP sensor.

I’ve checked out a TT and a golf how to but I’m still struggling. Can I have a definitive description of exactly where it is, a decent picture would be useful maybe even a Cupra r video.

As an aside the TT guide said I’ve got to get the front bumper off, is that right?

rgds

ps it’s NOT the MAF I’m looking at!!
 

Connor H

Active Member
Dec 19, 2019
1,014
498
Essex
Isn’t it on a pipe leading to one of the side mount coolers ? Mines an LC so will be slightly different but I could see it by simply standing over my engine bay and looking straight down, mounted on the pipe to my side cooler, so can’t imagine it will be much harder on the LCR.


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MK R BOY

Active Member
Mar 5, 2008
139
3
hi connor

sorry mate I should of said I've checked out two guides and am struggling, could I have a definitive description and a picture??

Sorry for the sarcasm but based on my query your reply hasn't helped much, thanks for trying though.

picture??? arrow??

regards
 

Connor H

Active Member
Dec 19, 2019
1,014
498
Essex
Should give you some idea, i guess itll be under the battery, either bumper off or if you're lucky through the wheel arch by removing the trim

good luck

Screenshot 2020-09-13 at 20.00.03.png
 

MK R BOY

Active Member
Mar 5, 2008
139
3
Ok, that helps a little more, I’ll check it out today.

out if interest have you had the bumper off before?

rgds

ps sorry for the p#£& taking tone!

pps

I think I’ve found it, it looks accessible as well. I’ll keep you posted. Cheers Connor.
 
Last edited:

Connor H

Active Member
Dec 19, 2019
1,014
498
Essex
Ok, that helps a little more, I’ll check it out today.

out if interest have you had the bumper off before?

rgds

ps sorry for the p#£& taking tone!

pps

I think I’ve found it, it looks accessible as well. I’ll keep you posted. Cheers Connor.

Ah nice one glad you found it . I couldn’t find any pics of where it’s actually located so diagram is next best thing Lol

Yeah ive the bumper off a couple of times, not a fun job by yourself. Definitely need spare hands on it.


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Thai-wronghorse

Self proclaimed Cupra R addict & butcher!
Dec 3, 2015
2,195
1,037
Kent
No need to remove the bumper to access the MAP sensor on a LCR.
Remove the battery and housing along with the 2 slam panel trims above the nearside headlight and you should have enough room.
Be aware that the 2 x torx screws holding it into the boost pipe are regularly corroded so may cause you some headaches if they round off.

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MK R BOY

Active Member
Mar 5, 2008
139
3
well the good news is that the MAP is out. Bad news is that both screws actually sheared off, which meant the pipe had to come out, couldn't get to the jubilee clips to that got cut off. And the plastic connector broke as well!!

Off to SEAT tomorrow with a shopping list, lets hope it actually fixes the problem.
 

MK R BOY

Active Member
Mar 5, 2008
139
3
Omg do you know how much a new pipe is? Jesus! ( other religious icons are available).

currently trying to either get the bolts out or a second hand eBay job.
 

MK R BOY

Active Member
Mar 5, 2008
139
3
New pipe is £200 from SEAT.

my first tip to anyone showing a MAP fault is to remove the pipe and clean the sensor without removing from the pipe, they almost always go apparently.

I’ve had a garage try to fix it, fingers crossed.
 

MK R BOY

Active Member
Mar 5, 2008
139
3
Ok, so an update.

the car went back together, and was fine for a while. The bleed messages went but the car was still holding back a little. The reader started throwing up a cylinder 4 misfire, I swapped coil packs over and the cylinder changed. I replaced the coil pack which had caused the misfire and the car was sweet as a nut.

car ran fine for a week or two but the hesitation has returned with a vengeance, very intermittent but still there.

It finally pulled up two fault codes,
17963 - boost pressure control:upper limit exceeded
16622 - manifold pressure/boost sensor (g31): signal too high.

does anyone with experience diagnosis these for me? How are they related and is it obvious whether one is causing the other? What should be the next port of call? How do i fix this?

many thanks
 

Connor H

Active Member
Dec 19, 2019
1,014
498
Essex
Ok, so an update.

the car went back together, and was fine for a while. The bleed messages went but the car was still holding back a little. The reader started throwing up a cylinder 4 misfire, I swapped coil packs over and the cylinder changed. I replaced the coil pack which had caused the misfire and the car was sweet as a nut.

car ran fine for a week or two but the hesitation has returned with a vengeance, very intermittent but still there.

It finally pulled up two fault codes,
17963 - boost pressure control:upper limit exceeded
16622 - manifold pressure/boost sensor (g31): signal too high.

does anyone with experience diagnosis these for me? How are they related and is it obvious whether one is causing the other? What should be the next port of call? How do i fix this?

many thanks

Not in the in depth analysis you were hoping for but one of those codes seem to be related to your N75 (first one)You could whip it off and check it’s not coated in crap, check the lines to and from it.

or if you have another one to try that could rule it out. I have a febi one I bought and didn’t use, if you’re local to Essex welcome to try.



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MK R BOY

Active Member
Mar 5, 2008
139
3
Unfortunately I’m about an hour or so from you. The N75 has those special ear crimp clamps, I’ll check it tomorrow to see what I can do.

in terms of checking the lines, do you mean for cracks? How would I check for blockages?

would a faulty n75 cause the other code?

cheers for help.
 
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