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+---- Thread: 2021 Audi RSQ8 Quattro (4MN) V8-4.0L Turbo (DHUB) MHEV cold start rough idle (/showthread.php?tid=112732)
2021 Audi RSQ8 Quattro (4MN) V8-4.0L Turbo (DHUB) MHEV cold start rough idle - iyade46 - 20-11-2025
2021 Audi RSQ8 Quattro (4MN) V8-4.0L Turbo (DHUB) MHEV cold start rough idle for like 1 min and then all go normal and that problem come back only in the next cold start after leave the car for long time in a cold weather
so the only fault i can read in the ecu is P055F00 Engine oil pressure out of range
and also that fault didnt come back while the car is hot only on the cold start
any common problem with that engines to have the cold start bad idle please?
thanks in advance
RE: 2021 Audi RSQ8 Quattro (4MN) V8-4.0L Turbo (DHUB) MHEV cold start rough idle - al70 - 20-11-2025
few possible causes, wrong oil used during service, blocked oil filter, oil pressure sensor and worse case oil pump is failing, i'd get this sorted quick, on cold start,turbo is most likely not getting oil
RE: 2021 Audi RSQ8 Quattro (4MN) V8-4.0L Turbo (DHUB) MHEV cold start rough idle - iyade46 - 20-11-2025
(20-11-2025, 21:28 PM)al70 Wrote: few possible causes, wrong oil used during 5ёяvїcё, blocked oil filter, oil pressure sensor and worse case oil pump is failing, i'd get this sorted quick, on cold start,turbo is most likely not getting oil
thank you so much brother is the causes the rough idle too for like one minute on the cold start