error codes 25 and 34

[rico1979]

Hi folks, just used the 2 for the first time in few weeks and its going into safe mode, flashing error codes 25 and 34,

car is a mk2 rev 2 turbo, whats best thing to start with to rectify this

any help muchly appreciated

[littlemisstubby]

Hi mate. Error 34 is overboost. Error 25 is running lean.

What mods and boost pressure are you running?

[rico1979]

No real mods as such just decat aftermarket induction and japspeed exhaust. Running at 14psi i believe, controlled by mbc. But as soon as it hits 3 psi it goes into safe mode. been running this setup over 2 years

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[_Al_]

MBCs are prone to boost spikes in cold weather. It's also possible that the MBC has worked itself loose from one of the hoses, blocked up or jammed which can give all sorts of problems.

Best bet would be to set it back to stock to see if the problem clears and clean up / check over the MBC while it's off.

[rico1979]

Cheers would the boost spike not show on my boost gauge ? As its only getting to 2-3 before shutting off. Think il buy a new mbc aswell, as one fitted looks bit rusty etc. See how that goes too

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[littlemisstubby]

As its only getting to 2-3 before shutting off.

Are you running an FCD by any chance?

[Chris_D]

On the rev2, it behaves differently after a boost cut and will cut again at a much lower pressure. I can't remember if switching off & on is sufficient to stop this or you may need to reset the ECU to clear the codes.

[rico1979]

As its only getting to 2-3 before shutting off.

Are you running an FCD by any chance?

Whats one of them lol so chances are im not
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[rico1979]

Took off my mbc and the ball bearing seemed to be stuck down 1 of the nozzles. Took out and refitted it. Went for a run and boosted all the way back to 14, tried again few minutes later and cutting out again. Gonna order a new mbc just incase

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