HELP !!! P0236 Turbocharger Boost Sensor A Circuit Range/Performance - Alfa Romeo Forum
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Help HELP !!! P0236 Turbocharger Boost Sensor A Circuit Range/Performance

Please can anyone help me !!

I have a 1.9 jtd gt and every day for the past few months i keep on getting the same fault code p0236 which puts my car into limp home mode.
I have taken my car to Interservices (alfa specialists) at least half a dozen times to no avail and i have also tried independent turbo diesel specialists too with no luck and i have spent about 1000- and still no closer to solving the problem!!

I have had a new MAF and MAP sensor, i have been told its definatly not the egr. The egr and the manifold has been cleaned. All vacumm pipes have been pressure checked and waste gate is moving freely. A new boost pressure valve fitted. I also bought some turbo cleaner from innotec which interservices used to clean the variable veins and also replaced the turbo inlet pipe for a silicone one. After all this i still have the same fault.
The fault occurs when i get to 3000 revs or if there is any load on the turbo ie hard/continous accelleration for more than a few seconds or even up a slight gradient. ECU flags fault and leaves me in limp home mode.
can someone please help as i don't know who to trust as i have lost all faith in recent garages

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Mine does exactly the same...

If you turn the engine off then back on again, does it go back into normal mode?

Mine does, then the light goes off after so long.

I think I've got a boost leak though, so I'm going to get that sorted.
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I believe this is related to the solenoid that controls the variable veins. Had the same issue P0236 (Underboost) after doing major front end work on my 2.4. Not sure if the 1.9 has the same layout......

Turned out to be a 50 Ohm resistance across the multi electrical connector on the front right hand side. You need to check resistance of wiring back to ECU, should be 0 Ohms and remedy where required. I ended up having to bridge the multi connector as no end of switch cleaner would do the trick and it's impossible to get a small file in there.

If resistance is OK then it's probably the solenoid. On the 2.4 it's bolted above the left hand side of the rad and has 2 small bore rubber pipes coming from it. Easy job to replace.

Good luck

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just to confirm waht Deemac said - the location of the actuator / solenoid is the same on the 1.9s.

you can't miss it, right on the front by the slam panel has an electrical connection to it and a rubber pipe that goes off across the top of the engine and another that does down into the bottom of the turbo cold side.
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Remove the turbo and clean it fixed my problem in 5 hours my turbo was clogged with carbon causing the variable vaines to stick first remove the turbo tricky but possible took me 2 hours im no mechanic just a diy'er remove the actuator from the turbo small clip i used a little hook remove exhaust side of the turbo case 5 10mm nuts gently tap off casing to reveal the variable vaines there are 3 star bolts holding it all on recover the 3 spacers and keep safe clean all the carbon and make sure the variable vaines all move nice and freely then simply put back together reconnect to car i used new flanged nuts for the turbo from alfa romeo 1.50 each and a new cat to exhaust gasket 6 quid a mates code reader to clear the mcsf light and hey presto saved myself a fortune happy days
hope this helps
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Member car:

156 1.9 mjet 16v

turbo vane problem from what ive read on this forum
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boost , circuit , overboost , p0236 , range or performance , sensor , turbo problems , turbocharger , variable vane

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