Zafira B z19dth boost issue

[cheese_za]

I need some help with a problem I am experiencing.

Car developed a slight turbo whine and at low rpm/low load. After googling I put this down to a leak at 1 of the gaskets on the turbo. Car was still pulling like a train.

Then one day taking a drive the car felt very sluggish/laggy (I thought it couldn't been a blocked DPF) and once I got on the dual carriage way I got check engine light and limp mode.

I am getting fault code P0234-5B Boost Pressure Control Circuit Positive Deviation.

I did have a brief look under the bonnet but am not sure what to look for. Can't see any obvious damage to hoses/vacuum lines.

Here is a link for live data recorded to trigger check engine light and limp mode.

Any advice would be great thanks.

[davoc220]

Clean the map sensor and check the pipes going to the boost control solinoid as well as the solinoid itself.


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[cheese_za]

Clean the map sensor and check the pipes going to the boost control solinoid as well as the solinoid itself.


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Do you mean MAF sensor? If not, what's the MAP sensor.

Will check the pipes going to the boost control solenoid. I replaced that about 2 years ago.

[davoc220]

The map sensor is on the inlet manifold, it’s inclined to coke up


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[cheese_za]

The map sensor is on the inlet manifold, it’s inclined to coke up


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Thanks. Will check that now.

Can I use carb and brake cleaner on it?

[davoc220]

Brake cleaner should be fine, if there’s any deposits on the sensor mesh, use a cotton bud to gently take it off tho


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[cheese_za]

I have checked the MAP sensor, it seems fine:

IMG_20200802_163116.jpg

I removed the boost solenoid. It is not blocked, and it actuates when current is applied to it. Vacuum lines refitting snugly.

Is the next step turbo removal?

Also, is the car still ok to drive like this?

[bigmac]

To me, that map sensor looks dirty

[cheese_za]

To me, that map sensor looks dirty

I did give it a clean before replacing in any case.

[cheese_za]

The problem had finally presented itself. I went to top up the screen wash this morning and could hear the distinct ticking noise I had not heard before.

z19dth fault.JPG

I will patch it with self vulcanizing tape in the mean time, but can anyone advise what the replacement for this is please?

Thanks