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TonyM21 TonyM21 is offline
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Join Date: Apr 2018
Car: E92 335i
Question N54 limp mode problem!!! - 04-20-2018, 06:11 PM

Hey guys, would be grateful if anyone can solve this mystery!!!

Bought a low mileage 335i a few years back and the car was in perfect condition. Decided to buy straight through down-pipe off eBay and get the secondary catalyst replaced with a straight through. Also decided to get a remap straight after this.

When I drove the car it kept going into limp mode around 2000rpm in 6th gear. Long story short decided to take the remap off as thought this was the problem but the car keeps doing it

It is never under full throttle that it occurs. Always in low rpm.

Have plugged it in many times and no fault code comes up except boost deactivation which indicates the car has gone into limp mode for some reason.

Any ideas as to what it could be??


Last edited by TonyM21; 04-20-2018 at 06:17 PM.. Reason: Spelling
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