Check Engine Light On and Off
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Check Engine Light On and Off
Check engine light 2012 MBZ E350. On for a day, off for two days. Codes P0346 and P0347 - camshaft position sensor. Idles and runs fine. Wiring harness fine. Been going on for 2-months! Why doesn't the light just stay on?
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
Why not just replace the sensors? This is a VERY easy thing to do. Takes about ten minutes.
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From: Chicago
19 GLA45, 86 560SL, former: 14 E550 4Matic, 09 E350 4Matic, 83 240D manual, 78 450SLC, 81 500SLC
They're relatively cheap, easy to replace, and probably in need of replacement anyway. Just do them all. OEM or Bosch.
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
you may discover there's more to that fix than a new $50 CPS.
I am saying... oil in harness or shifted reluctor or limp tensioners or here CPS bad ECU.
Your best bet is always to be proactive with your Mercedes care.
I am saying... oil in harness or shifted reluctor or limp tensioners or here CPS bad ECU.
Your best bet is always to be proactive with your Mercedes care.
Last edited by CaliBenzDriver; Jan 30, 2025 at 06:01 PM.
Super Member
Joined: Mar 2024
Posts: 618
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From: Chicago
19 GLA45, 86 560SL, former: 14 E550 4Matic, 09 E350 4Matic, 83 240D manual, 78 450SLC, 81 500SLC
you may discover there's more to that fix than a new $50 CPS.
I am saying... oil in harness or shifted reluctor or limp tensioners or here CPS bad ECU.
Your best bet is always to be proactive with your Mercedes care.
I am saying... oil in harness or shifted reluctor or limp tensioners or here CPS bad ECU.
Your best bet is always to be proactive with your Mercedes care.
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No oil on the harness. My friend came over found the actual values of both left and right intake camshaft positions do not match the the specified position. Also found the solenoids struggled to advance/retard camshaft timing. Time to remove the intake manifold and inspect basic timing of camshaft position. This might be more than just replacing the CPS...
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Out Of Control!!
Joined: Apr 2019
Posts: 12,272
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
No oil on the harness. My friend came over found the actual values of both left and right intake camshaft positions do not match the the specified position.
Also found the solenoids struggled to advance/retard camshaft timing.
Time to remove the intake manifold and inspect basic timing of camshaft position. This might be more than just replacing the CPS...
Also found the solenoids struggled to advance/retard camshaft timing.
Time to remove the intake manifold and inspect basic timing of camshaft position. This might be more than just replacing the CPS...
Brand new factory stock already struggle to time camshafts with low oil pressure.
Correlation codes are related and require cams
New VVT Gears and/or Intake camshaft may be needed.
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Thread Starter
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My street princess. Always garaged. Always dealer maintained. Been in urban high desert the last 4-years. Brutal summer heat and extremely low humidity (dryrot). Before that, 9-years coastal Cali.
Last edited by RicoMarx; Jan 31, 2025 at 08:43 PM.
Out Of Control!!
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
normal maintenance/repair
Startup smooth. Idle smooth. Engine warm smooth. Light went on 2-days ago for an hour. Been off ever since.
My street princess. Always garaged. Always dealer maintained. Been in urban high desert the last 4-years. Brutal summer heat and extremely low humidity (dryrot). Before that, 9-years coastal Cali.
My street princess. Always garaged. Always dealer maintained. Been in urban high desert the last 4-years. Brutal summer heat and extremely low humidity (dryrot). Before that, 9-years coastal Cali.
part time code... timing is borderline partly good...
I would guess old chain tensioners on low pressure.
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W212 FL
I would still go to a Mercedes-Benz shop to have them check the codes . Why I'm saying this , I had seen an engine malfunction light on my W212 but a few days ago it went off. When I visited the dealer I had asked them to check the codes and they had retrieved a hidden code which I would have never been able to see with a generic ODB II scanner
Joined: Nov 2016
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From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Generic OBD scanners are a waste of money at best, and can be misleading and costly at worse. Use XENTRY/DAS or a Mercedes-specific Scanner.
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
Thread Starter
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Diff Results
One place said no oil in the harness, another said oil was in the harness but didn't give me the P codes. Wants $1500 for sensors parts & labor (oem for all four is $120 on Amazon). Takes 10mins to changeout each one! Light was now off for 4-days came back on for 1-day. Reset computer via negative battery post clamp removal 2-mins. Light off for 3-days....
Out Of Control!!
Joined: Apr 2019
Posts: 12,272
Likes: 6,918
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
lottery
One place said no oil in the harness, another said oil was in the harness but didn't give me the P codes. Wants $1500 for sensors parts & labor (oem for all four is $120 on Amazon). Takes 10mins to changeout each one! Light was now off for 4-days came back on for 1-day. Reset computer via negative battery post clamp removal 2-mins. Light off for 3-days....
Hopefully CEL will comes up less often.
