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Old 1 Week Ago   #1
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P0235 & p0236

So I went on my holidays to Powys ���������������������������� (worth a visit) where there are one or two hills. On one, Gerrard ran out of puff in third gear and so I had to change down to second, plus a lot of revs, to keep the car from losing speed further. That made the EML come on, although the car clattered over the crest and seemed to run fine despite the error.

I scanned the beast when I got home and got 4 codes:

No a/c system pressure (a hole in the condenser might have something to do with that one)
0235
0110
0236

I had a 0235 quite recently which I fixed by replacing the MAP back in July (old one was oiled up) and the EML disappeared by itself as soon as the new MAP was in there, so it’s a bit boring to see it immediately return.

This combo’ must have happened to someone already, so apart from checking the Wiring and tubing to the various senor/solenoid etc. what’s the answer?


Solenoid valve (Pierburg) and the MAF (Bosch) are just a few years but 97,000 miles old.
MAP sensor (Bosch) is brand new.
Car runs fine... though some boost seems to be missing... ?
The solenoid pipes are fine (checked during the recent clutch change).

I didn’t clear the 0235 when I swapped the MAP so that error may have been caused by the old one.. and so a red herring.

Ralf S.
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Old 1 Week Ago   #2
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Re: P0235 & p0236

Any good?


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Old 1 Week Ago   #3
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Re: P0235 & p0236

You checked the intercooler hose that goes through the wheel arch liner on the passenger side. Mine had a huge hole in it and pretty much struggled for boost, strange thing was didn't get loads of smoke though?
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Old 1 Week Ago   #4
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Re: P0235 & p0236

Quote Originally Posted by Zeewulf View Post
You checked the intercooler hose that goes through the wheel arch liner on the passenger side. Mine had a huge hole in it and pretty much struggled for boost, strange thing was didn't get loads of smoke though?
Yes.. I recently changed the clutch, so had all that side completely apart and I put it back dead carefully, so nothing could rattle or fret. All in good condition (apart from the wheel arch liner had rubbed a faint groove into the said hose in the past.. but nothing too severe).

The car gave the same error before the clutch job. I fitted a new MAP and the error immediately disappeared... but obviously "something" isn't quite happy.

If I boot it over about 3300 rpm, there is a chance that it will trigger the EML. Yesterday I was trying to provoke it.. but ran out of road before it reached quite as many rpm as I wanted... so could be just luck. I'm sure it's not "fixed".


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Old 3 Days Ago   #5
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Re: P0235 & p0236

Quote Originally Posted by Ralf S. View Post

If I boot it over about 3300 rpm, there is a chance that it will trigger the EML. Yesterday I was trying to provoke it.. but ran out of road before it reached quite as many rpm as I wanted... so could be just luck. I'm sure it's not "fixed".

I managed to have a hot engine and a long straight empty road away from anyone who wants to breathe, etc. so I managed to give it a big boot and a few thousand rpms.

There wasn't too much smoke (small throttle opening seems to reduce it, regardless of the revs) but when it got to 3300-ish rpm, the light came on again. I haven't put it on the reader but I guess it'll be the 0235 again.

Does this sound like boost actuator valve, or the actuator itself (though that's purely mechanical, so I dunno how any sensor would know if it was sticking) .. or the MAF?

MAP is new and the EGR is blanked off (but could that be sticky and registering the error)?



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