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A few days ago the malfunction warning light illuminated on my automatic Q30 but no apparent fault was showing itself. A quick check in the handbook revealed it could be a number of things, so I took it to my local garage and a quick diagnostic check showed up fault code P13C2 ‘manufacturer specific’. Given that the car wasn’t manifesting any problems, the light was reset and I carried on. Yesterday, the car (at times) would only drive in ‘limp mode’ and would only change gear at much higher revs and wouldn’t work in sport or manual mode. The warning light has stayed off though.
A google search has revealed a similar fault code for Mercedes Diesel engines (the same engine as the Q30) and also the same fault symptoms. The fault appears to be the exhaust flaps / exhaust actuator.
I’ll be going back to the garage in the next day or so but I was just wondering if anyone else has come across this issue and has any idea what the solution / fix might be?
Many thanks, Steve.
 

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Sorry to hear your car has issues, I am not familiar with the diesel engines. Have you a local independent mercedes garage? They would probably gave better software for diagnostics to understand the fault code and be familiar with the engine also I guess. Maybe they could even test the part you mentioned?. Good luck and keep us updated 🖐
 

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Sorry to hear your car has issues, I am not familiar with the diesel engines. Have you a local independent mercedes garage? They would probably gave better software for diagnostics to understand the fault code and be familiar with the engine also I guess. Maybe they could even test the part you mentioned?. Good luck and keep us updated 🖐
Thanks for that. Latest update........took the car back to my local garage this morning who arranged for an advanced diagnostics check to be carried out. Fault confirmed as exhaust flaps motor. Part now being sourced and hopefully the car will get fixed next week. I’ll update again with more details as soon as it’s been sorted.
 

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Great news Steve as you were correct with the diagnosis. 🖐👍
 
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