GolfGTIforum.co.uk
Model specific boards => Golf mk5 => Topic started by: Dobbs on 17 June 2019, 09:15
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Hi folks, my MK5 GTI has suddenly started to cough and splutter under medium/hard acceleration. I've plugged in a code reader and got the following:
A/C refrigerant high pressure switch (F118) sporadic over pressure.
I've found out how to replace the switch so will give it a go - can someone tell me why the pressure switch would limit acceleration (safety 'feature' perhaps?).
At the same time I've lost Cruise Control - would this also be related to the pressure switch?
Thanks for any and all advice :smiley:
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Additional - jut noticed that the idle is around 1200rpm, which is rather high - could there be a vacuum leak as well as a sensor problem?
There was a leak in a vacuum pipe last year which gave rough running so I'm wondering if I've actually got two problems - any thoughts?
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Hey guys,
A quick update - replaced the pressure sensor at the weekend (highly recommend getting a 17mm crows-foot spanner) - it's a fiddly job, best to remove the lower engine cover, loosen the sensor with the crows foot and then unscrew from above.
And now there's a new error code/fault: AC Pressure/Temperature sensor (G395) sporadic no signal/communication.
Unfortunately replacing the 1st sensor did not solve the missfire, so I'll investigate the 2nd sensor and see what that's all about..
To be continued :rolleyes:
Oh yes, the idle has dropped (might be down to me wriggling vacuum pipes) and cruise control is back.
PS - booked into my local workshop next Monday just in case :smiley:
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Hi guys,
It seems like there's a period after replacing the sensor during which the system resets itself, so all is now well. I went for a test drive immediately after replacing the sensor and the misfire was still present, but after a long drive it's now running fine.
Fingers crossed, the I is now back in my GTI!
Have a good day all.