zichen169

Hi everyone,

For the past month, my 2012 c250 coupe with 47k miles having issue with the camshaft and with the code p0340. The car drives fine, but have intermittent delayed starting issue. I have replaced the two camshaft sensors but the problem still persist. Today, I went back to my mechanic and he said there might be issue with timing chain skipping and it need to be replaced or there is a issue with camshaft magnet.

So my question is

1) He estimated $3000 to replace the timing chain for my car. Is this legit or bs since he said the whole engine have to pull out to replace the timing chain.

2) Would replacing camshaft magnet or timing chain solve the issue, is there any other cause?

thanks guys

chazzz

2012 Mercedes C250? that is a 3 year old car and it's still under 50k miles, take it to the dealer for a warranty repair.

I believe that all Mercedes are covered by 5 year and 50,000 miles warranty.

michail71

He could just be out of warrant if the car went into service in 2011. But sometimes MB will partially cover a failure of this magnitude just out of warranty.

211.070

The timing chain could be stretched. This is not very common, but does happen. The camshaft adjusters would be a more likely problem. The engine does not have to be removed to replace the timing chain though.


Since you are not going to the dealer. A couple other things could be in play. Did this start after an oil change? If the wrong filter was used you could have low oil pressure. This will cause timing faults as well.

zichen169

211, by camshaft adjusters do you mean the camshaft magnet like this one on amazon ?

Also, if the timing chain is stretched, are there any symptoms or anyway to check to make sure? At this moment, my car is running perfect, the only problem is delayed cranking and startup

thanks!

zichen169

Thank you for the feedbacks everyone.

I took my car to the dealer and the issues turned out to be timing chain tensioner and timing chain adjuster both faulty. Mercedes USA was able to fix my issue for free under goodwill because my car just came out of warrenty! Thanks everyone the car runs perfect now

Carsy

I would shame your mechanic as being incompetent or a charlatan. The industry does not need these types.

ConfusedC250

I'm having the exact same problem and I'm trying to figure out how you got it covered by Mercedes with Goodwill.

my car just went out of warranty on December 29 and has 48,000 miles. They are trying to say that it is not covered by warranty. I am looking for something that will help me argue my case. Any suggestions? The

Colin G

There is a class action lawsuit going about this I believe.


Mercedes knows this is an issue and has for years.

dieseldoc

I believe the suit is for m272 6 cylinder engines. I do not know if it is for m271 4 cylinder engines.

MarcKaufman

I just had my timing chsin replaced today. My car has 100k. Mercedes knew of the problem because the new parts come with a selonoid to take some of the tension off of the engine and controlling the chain. This should have been a recall, no reason to spend $4000 on an error in engineering which mercedes recognized.

ThoughtIKnewAll

First wanted to say thanks to all who have been diligent in providing accurate information in regards to the 2012 W204 1.8L Turbo engine known issues with timing of the CamShaft, and it's multiple appparant causes, and consequences.

Im new to the mbworld, so please go a little easy on me if I don't get all the terminology, or give precise info etc....but if you'll tell me my errors I will do my due diligence in learning from the mistakes and be sure to get it right next time.

So my first MB was a 2012 C350 Coupe, purchased new and drove it 90k, without a single major issue needing to be repaired. Literally only scheduled maintenance at my local indie shop, and not anything more ever required. I'm OCD when it comes to regular maintenance, and replacing parts that are starting to head in the direction of needing replacement even if it's not necessarily required at the time I'm given such information by my local indie shop manager.

Loved driving the 2012 C350 Coupe as my every day driver, and regret that I sold it, and ended up driving what is turning out to be a nightmare.

I had such a great experience with the C350, I decided to stay in a C Class W204, and even found the same year, just a downgrade to the C250 (long story - painful now to think about - prefer not to talk about!).

My issues began similar to most I've read about:
Cold start would cause a rough idle that would go away and smooth out quickly, and then no issues after that. No error codes, nothing mechanic could pin point as issue at that time.

6 months later and I'm going through a nightmare with this vehicle.

The rough idle on cold starts became a delay in acceleration after pressing the gas, and quickly degraded to its current state of random and intermittent extreme rough idling in park, neutral and while driving at various speeds. Sometimes while cold and sometimes while engine was warmed up.

i found a few posts of similar issues and took what seemed to be the most common solution that was working for others.

1. At this point my C250 Sport Sedan 1.8L Turbo was giving a Cam Timing Sensor Bank 1 Error code. So based on what I read in the forums I replaced both Bank A and Bank B Camshaf Magnets, and also Bank A and Bank B Camshaft Timing Sensors.

No improvement, and actually began getting additional Error Code that Cylinder 3 was Misfiring.

2. So now I Replaced my spark plugs and my Couls for all 4 Cylinders. Again, same issue persists and same error codes persist.

it appears I need to look at possibly replacing the timing chain and additional parts, depending on what the full diagnostic reports next week.

My question is about the Cylinder 3 Misfire. Can anyone please shed some light on the possibilities of what's occurred that causes a camshaft issue to grow to a Cylinder Misfire issue?

Can you please also advise what the likely repairs will be to the most likely causes of this issue, which I'm assuming will go well beyond fixing the camshaft timing issue??

Please help, im getting very worried about what the full diagnosis going to reveal next week so I'm try f to get myself prepare for the worse!

I miss my issue free 2012 C350 Coupe, and this ongoing disaster with my 2012 C250 Sport Sedan has me questioning whether I'll be sticking with Mercedes Benz, if I end up with a engine replacement and pay out of pocket since I'm out of my warranty.

Cheers,
J~

Oli975

I have a 2013 c250 sport coupe with 114,000km. I had the rattling noise on start up, the hard starts and the engine warning light. So after much research decided the cam adjusters and timing chain needed replacing. It was a big job but both cam adjusters, the timing chain and tensioner were replaced. It started no problem I cleared the warning light and everything sounded fine. Car drove without issue however 1500km later and everything is back to how it was before the repairs. Hard starts, rattle on start up and yesterday the engine light came on with the dreaded "cam"code. So has the chain stretched again....? Surely not!?? Any ideas... I dont want to be replacing the chain and cam adjusters every 2000km!

Aminu200

This is the same issue I am having.. have u found a solution yet? Please let me know thank you

michail71

Only solution is an expensive repair job if it's not under warranty.

Tgiang