Scanned and these 2 codes came up:
P034600 - position sensor (intake cam bank 2)
P002177 - position of camshaft deviates from value blah blah..

anyone else had these 2 beauties pop up?

I’ll be ordering a new sensor today.

read a couple issues that other engines had but not getting any symptoms like they had that required replacing of intake came actuator sprocket.

hopefully it’s just the sensor

 

Did you ever figure this out?

 

just saw this.

looks like it’s the camshaft sprocket. Same issues that the m156 has

 

I had just the P002177 as a stored code but no CEL. No other symptoms and it hasn’t come back. Still has me a little uneasy. My mechanic said this is a “known” issue with early m177 engines until 2019, but there is hardly anything about it online. Apparently the code can come from a low oil level condition. I guess time will tell. Did you have it fixed? What was the cost?

 

At first I thought it was the camshaft adjusters which are located outside the heads but nope. It’s the sprockets. I replaced the wiring harnesses too since some say it’s oil building that screws with them from a leaking adjuster. That cost around $450 with parts and 11 hours of your time. If you do it yourself of course.

im changing the sprockets this year so each sprocket is $1000 from the dealer I got some very low mileage sprockets from Florida yard for $700 the pair. I got the timing tool kit for around $550 there’s more things to get and replace while the front of the engine is exposed so the $$ will go up but it’ll be necessary.

 

Sorry to hear of the troubles.. usually it’s just the cam magnet failure like you mentioned. Looks like your mechanical phasers are worn. This is usually caused by extended oil change intervals and very poor oil quality. Curios how often did you change the oil and what’s your mileage? Good luck with the repair. May be worth while ripping the front end completely off for ease of repair (bumper, crash support, headlights)

 

every 5k and before a track day. Liquimolly oil and I currently have 130k miles lol I bought the car at 75k miles. I’be been fixing what the previous owner neglected which was a lot

 

Good to hear your still going strong at 130k. Keep us posted on your progress and repair. Take a good look at those chains while your in there. Might be worth while doing a timing chain overhaul with the repair as well.

 

Yeah I'll be replaceing pretty much all the timing components.. fml. lol and yeah hitting 130k at the track was great she still pulls very hard. The issue im getting for the deviating values is currently and intermittent problem.

 

That would be the best thing to do to guarantee at least 100k more miles, also no trouble codes returning from a worn/stretched timing chain. It’s a big job but after the repair you guarantee the service life of the engine drastically.

 

Where did you purchase the timing chain tools for the repair?

 

Thats good to hear. and I bought the timing tool kit from Ebay. I plan on doing the job once I get a house this year and buying a 2 post lift that'll be installed in the garage. lots of stuff going on atm so its on hold. plus.. I have another track day in July at Buttonwillow, should be fun.

Ebay Timing tool kit

 

Just an update to this.. it didn’t click until now that this might be a crank sensor and cam sensor issue. If I’m lucky that’s it. I’ll be replacing those sensor and we’ll see how it goes.

long time waiting to start this fix but now I have the time to do so

I’ll keep you guys updated since I started dismantling the front of the car already.

live updates on my instagram btw!

 

Sooo anyone know where the crank sensor is? I peeked around and can’t seem to find it?

 

Update: Replaced all 4 cam position sensors and crank sensor and so far no more check engine light. All codes mentioned are gone..

Also feels like i got full power back, did a fat burnout going on the onramp lol

 

Update:

issue is still intermittent but staying for longer this time.

I’ll definitely be changing the camshaft sprockets this time instead of just replacing sensors.

I’ll post camshaft degree values as this goes along.

 

I had a feeling this would be your fate. Especially since you had the early m177 engine build. Hope you finally get this taken care of. I would be excited to see some pictures of the old timing components to see if there is any substantial wear! Also considering you track quite often. Keep us posted and happy wrenching👍🏼

 

Alright after months of not doing anything im doing something now.. lol

As always i'll need some help along the way if theres any mercedes techs that can chime in on some removal tips or send me some sweet wis pdf sheets thatll be helpful.

I scanned the car today and I was checking the camshaft values to see which cam sprocket was having the issue. after a couple min. of seeing the values at 3,000rpm-3500rpm turning of and on the actuators it turned out that the LEFT INTAKE sprocket is the culprit here. It's stuck at 35 degrees.

Needless to say I need ro get this thing fixed since i've missed over a year of some sweet track time.

 

I had the donor parts for over 8 months already so looks like ill just be taking the cam sprocket out of one since both exhaust and intake share the same part number*

Things I need help on currently:

removal of intercoolers - I deleted the wis manual a couple months ago for this step:/ if anyone can send it to me that'll be great.

torque specs:
valve cover
fuel line bolts
injector bolts
front cylinder head cover

thats it for now.

 

can help with wis. PM’d you