P0235 - Turbo/Super Charger Boost Sensor A Circuit - Alfa Romeo Forum
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Old 07-08-08
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P0235 - Turbo/Super Charger Boost Sensor A Circuit

Following on from my MCSF thread I've cleared out the existing codes, and now I only get this one


P0235 Stored Turbo/Super Charger Boost Sensor A Circuit


I have no problem with performance (see my Porsche beating thread), but the MCSF comes up now and again because of this failure, since I cleared out my other faults, this one only seems to happen when I'm decelerating ... any thoughts?
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Old 07-08-08
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Re: P0235 - Turbo/Super Charger Boost Sensor A Circuit

Originally Posted by 156Chris View Post
Following on from my MCSF thread I've cleared out the existing codes, and now I only get this one


P0235 Stored Turbo/Super Charger Boost Sensor A Circuit


I have no problem with performance (see my Porsche beating thread), but the MCSF comes up now and again because of this failure, since I cleared out my other faults, this one only seems to happen when I'm decelerating ... any thoughts?
Turbo stall
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Old 07-08-08
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Re: P0235 - Turbo/Super Charger Boost Sensor A Circuit

Hmmm turbo stall, look at your other threads on this subject, I can confirm that I had been accelerating, not particularly hard though, but the engine was still cold at this point so I don't know if that makes a difference ...

... the replies on other threads seems to imply that I should try a different map ... but are there any thoughts



(also my stat needs changing although I don't believe this contributes to this error)
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Re: P0235 - Turbo/Super Charger Boost Sensor A Circuit

Originally Posted by 156Chris View Post
Hmmm turbo stall, look at your other threads on this subject, I can confirm that I had been accelerating, not particularly hard though, but the engine was still cold at this point so I don't know if that makes a difference ...

... the replies on other threads seems to imply that I should try a different map ... but are there any thoughts



(also my stat needs changing although I don't believe this contributes to this error)

Speak to Augusto at red dot
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Old 07-08-08
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Re: P0235 - Turbo/Super Charger Boost Sensor A Circuit

Originally Posted by chrisd_b View Post
Speak to Augusto at red dot
I'll speak to Adie at AHM first (as he did the remap) and see where that takes me ...





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Re: P0235 - Turbo/Super Charger Boost Sensor A Circuit

chris, get ahm to lower the boost level to see if it cures it.
lower torque limiters could be another possibility, but your best bet is red dot, get it on their rollers and see what its doing.
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Old 01-11-09
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Originally Posted by jasons View Post
chris, get ahm to lower the boost level to see if it cures it.
lower torque limiters could be another possibility, but your best bet is red dot, get it on their rollers and see what its doing.
Originally Posted by 156Chris View Post
Following on from my MCSF thread I've cleared out the existing codes, and now I only get this one


P0235 Stored Turbo/Super Charger Boost Sensor A Circuit


I have no problem with performance (see my Porsche beating thread), but the MCSF comes up now and again because of this failure, since I cleared out my other faults, this one only seems to happen when I'm decelerating ... any thoughts?
Oh dear, Its over boosting. Sounds like the vanes are sticking in the turbo. Had the same problem with my 2.4 and 1.9, although as the problem gets worse the car gets more and more power low down. Recon turbo from Turbo Technics £376.63
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Old 01-11-09
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Originally Posted by SLOWDRIVER View Post
Oh dear, Its over boosting. Sounds like the vanes are sticking in the turbo. Had the same problem with my 2.4 and 1.9, although as the problem gets worse the car gets more and more power low down. Recon turbo from Turbo Technics £376.63
Digging up this old post ... It is 100% not the turbo (I've raised some more threads since this one) as I sometimes get the MCSF even before I've started the car, on alfadiag it comes up as a plausability error which means that 2 or more sensors don't agree ... I actually captured using logging data when this occured recently (measured boost/measured airflow), the boost perfectly matched the target boost, however the measured airflow had dropped briefly ...

... I'm currently doing more logging (although I don't tend to get the MCSF at this time of year) to determine if it is 100% the MAF as it does seem a bit of a leap of faith ...


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check all of your vacuum pipes to thr turbo actuator. I had a similar problem with my 20V jtd. Turned out to be a cracked rubber pipe. Fixed it fo 20p
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Originally Posted by driver33p4 View Post
check all of your vacuum pipes to thr turbo actuator. I had a similar problem with my 20V jtd. Turned out to be a cracked rubber pipe. Fixed it fo 20p

As I said earlier, it happens sometimes when the car is even on (key in the MAR position) also if anything it is actually happening less and less, if it was a cracked rubber pipe then it would get worse over time
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Old 04-11-09
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hi - I have a 147 jtd 8v with the same problem - happens randomly on coming off the power like coming to the exit of a motor way etc.....not everytime but sometimes it switched off all power to the electrics, albeit the engine still runs (pretty dangerous in the dark nights at the moment) and then seems to correct itself as if nothing had happened - is this "limp mode"? Others appear to suggest this could also be a cracked pipe on the turbo (confess I have been too busy to get it sorted as it seems to always fix itself)
Another characteristic is that sometimes when accelerating the engine would speed up too quick - similar to the feeling of a dodgy clutch, but again its quite random.
Last thing I want is to go the main dealer and get shafted with random suggestions as to how to fix it and having to keep going back until fixed right and shelling out cash every visit
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Old 10-03-10
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does an over boosting turbo produce **** loads of smoke??
I have error code p0235 but performance is fine. Phoned dealer and said I wanted a turbo boost sensor and what they offered seemed (over the phone) to be the solenoid valve on the top of the rad??
I suspected EGR and blanked it - seemed much better, so have just put a new one on but the smoke is back. At night I can lose a whole lorry from rear view mirror if I boot it!
Ran target turbo and actual turbo sensors on alfadiag and the graph seems higher on the actual, going of the scale regularly. Do I change the valve or the MAP?????
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Originally Posted by mike jagger View Post
does an over boosting turbo produce **** loads of smoke??
I have error code p0235 but performance is fine. Phoned dealer and said I wanted a turbo boost sensor and what they offered seemed (over the phone) to be the solenoid valve on the top of the rad??
I suspected EGR and blanked it - seemed much better, so have just put a new one on but the smoke is back. At night I can lose a whole lorry from rear view mirror if I boot it!
Ran target turbo and actual turbo sensors on alfadiag and the graph seems higher on the actual, going of the scale regularly. Do I change the valve or the MAP?????
A split intercooler turbo hose will cause tons of smoke
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Also give the MAP sensor a clean before buying another
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Originally Posted by 156Chris View Post
I'll speak to Adie at AHM first (as he did the remap) and see where that takes me ...





(hasn't this been nice ... not a single bit of abuse between us ... I'll be seeing you in WOT !!!! )
oh dear, a remap. Clean your EGR out aswell and check out the inside of the inlet manifold.


I've had my fill of solving remap problems this year.
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Old 11-03-10
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Originally Posted by Smaky View Post
oh dear, a remap. Clean your EGR out aswell and check out the inside of the inlet manifold.


I've had my fill of solving remap problems this year.

Holy thread resurrection batman !!!! ... my problem was actually the map sensor needed cleaning ... also to be fair I had been getting that error code prior to the remap


My EGR is still fine and I've had my remap for 50k now
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I was responding to Red.
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Old 11-03-10
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Originally Posted by Smaky View Post
I was responding to Red.
well you did quote my post ... And red didn't mention remaps ...
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