Jellybean64 said:

Hi all, question on the dreaded suspension faults cropping up. got a 2010 D4 HSE, had a few issues with warning lights, and error code C1A18 - pressure increases too rapid when filling reservoir. - i have seen lots of posts that say even when put into dealers they still fail to fix it. i have changed the normal (front valve block / mid-valve block, and due to lots of other triggering issues and a battery at 12.3 volts replaced that as well, and don't get me wrong, it is better, but not fixed. I just want to see if i am missing anything before i head for the compressor change. seen posts saying this did not sort, and i have to say, it feels like an electrical / signal issue as intermittent. Just wanted view on whether i should just go for the compressor? thanks in advance

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gstuart said:

plus 1 what’s already been said

the air reservoir tank can leak along the weld on the top of the tank , might be an idea to remove the lower compressor cover and use some soapy water around all of the pipes and compressor cap, plus the valve blocks you’ve replaced as the Voss connectors can also leak

As a side note if u take a pic of the compressor plse it would be handy for future ref as there are 2 x types

If nothing is evident , get hold of a 6mm push fit cap and where the pipe goes to the air tank from the reservoir valve block cap that off so in effect ur blocking off the air tank , then see if it makes any difference

At this stage if it’s still throwing codes ur need diagnostics as ur then be able to see the live data of the air suspension system , also very handy to have a multimeter

Please don’t dive head first otherwise ur drive yourself nuts in trying to find the errors

See you’ve fitted a new battery and don’t wish to come across trying to teach u how to suck eggs but plse give the new battery a full charge

Hope that also helps on top of the advice from other members

Click to expand...

gstuart said:

plus 1 what’s already been said

the air reservoir tank can leak along the weld on the top of the tank , might be an idea to remove the lower compressor cover and use some soapy water around all of the pipes and compressor cap, plus the valve blocks you’ve replaced as the Voss connectors can also leak

As a side note if u take a pic of the compressor plse it would be handy for future ref as there are 2 x types

If nothing is evident , get hold of a 6mm push fit cap and where the pipe goes to the air tank from the reservoir valve block cap that off so in effect ur blocking off the air tank , then see if it makes any difference

At this stage if it’s still throwing codes ur need diagnostics as ur then be able to see the live data of the air suspension system , also very handy to have a multimeter

Please don’t dive head first otherwise ur drive yourself nuts in trying to find the errors

See you’ve fitted a new battery and don’t wish to come across trying to teach u how to suck eggs but plse give the new battery a full charge

Hope that also helps on top of the advice from other members

Click to expand...

gstuart said:

Here’s also some pics , plus does it drop overnight plse , thks

hope it helps

View attachment 282285


View attachment 282286

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