Car playing up today agin with boost (or lack of).
Had it scanned and the fault says 'Charge Pressure Maximum Limit Exceeded P1555 Upper limit reached - Intermittent'
I have a post further down where someone mentioned the brake switch but that seems fine.
Anyone had the above and what was the cure? I'm thinking N75 valve which has never been replaced but could it be anything else?
MM
Intermittent P1555 fault code
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MountainMutant
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Intermittent P1555 fault code
2017 RS6 PE Nogaro 
Re: Intermittent P1555 fault code
N75 was the culprit when I was getting that code. The valve had not completely failed, but was slow to react, so under hard acceleration in a higher gear, it would throw the code and go into limp mode.
Other possibility is a leak in one of the various lines to/from the turbos. Replacing the N75 valve is the easiest, but most expensive test. You can also disconnect the wastegate line from the N75 and put pressure to it to make sure it holds the pressure, and the wastegates are opening. If so, then it's back to replacing the N75.
Good luck!
Other possibility is a leak in one of the various lines to/from the turbos. Replacing the N75 valve is the easiest, but most expensive test. You can also disconnect the wastegate line from the N75 and put pressure to it to make sure it holds the pressure, and the wastegates are opening. If so, then it's back to replacing the N75.
Good luck!
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MountainMutant
- 3rd Gear
- Posts: 259
- Joined: Sat May 13, 2006 7:29 pm
Re: Intermittent P1555 fault code
Just one.
Could be pressure sensor but my money's on the N75.
Could be pressure sensor but my money's on the N75.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Intermittent P1555 fault code
Yeah, and unlike pretty much everything else on these cars, it's pretty easy to get to. Just remove the air cleaner assembly and it's hanging off the back of the intake manifold.
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