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Check engine light

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Old Apr 13, 2008 | 01:41 AM
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tyronewheatley's Avatar
tyronewheatley
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From: So.cal
w203
Check engine light
I have a 2004 c230 kompressor sedan...

The check engine light came on, ran the obd2 scanner said p0303.. cylinder 3 misfire... Changed out the spark plugs and wires.... reset the check engine light...

Light came back on... can ran rough at idle..... after cooling the car down and turning it back on, the car ran fine....... the check engine light went away on its own few days later... only to return the next day...

I notice the light comes on when the car is idling.. the car shakes at low rpms.... Once i shut the car off and restart it, the check engine light is still on but runs normally.....

Any suggestions or ideas??? already did the wires, plugs...
thanks in advance! The car has about 58k miles...
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Old Apr 13, 2008 | 02:39 AM
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JonathanMax's Avatar
JonathanMax
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From: Alhambra/Irvine, CA
W203 Kompressor 6spd SS, Audi B5 S4
vacuum hose?
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Old Apr 14, 2008 | 05:40 PM
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Kristen
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C-class
Take it to the dealer. I ignored a cylinder 3 mis-fire at idle, and guess what! Hole in piston #3 and a new engine on the way! outside of warranty, so I'm out a chunk of money.
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Old Apr 14, 2008 | 05:42 PM
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From: Markham, Ontario
2003 C230 Coupe
i have had that problem since last july and i havent fixed it yet lol
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Old Apr 14, 2008 | 07:08 PM
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tyronewheatley
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From: So.cal
w203
well besides changing the spark plugs and wires.. i have not done anything because the light has gone off now for a few days now... So i think as long as it stays off i'll wait until the next maintenance to get it checked out..

I'm very sorry to hear about your mishap with your cylinder.. i do agree mercedes does seem to have more problems than more simple cars.. I have had a few hondas that never had any problems ever...
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Old Apr 15, 2008 | 12:15 AM
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2013 C350 Coupe, 2005 C230K Kleemann Sedan, 2013 GLK350 4matic
I just picked up a P0420 code today. Time to replace at least the O2 sensor that is in front of the cat first to see if it clears. 50,500 miles on it, so I guess its due.
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Old Apr 25, 2008 | 10:41 PM
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w203
well i took the car to the dealership finally.. luckily i did.. I didnt know my car was still under warranty...

Anyways they ended up doing alot of stuff... pretty much almost like a new engine.. runs smooth now!!!!!! I'm very glad i took it there and i'm very pleased!!!
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Old May 15, 2008 | 01:41 PM
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raunen
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From: NYC
2005 C320 4Matic
check engine light occurred on thursday 5/07
dealer replaced left catalyst on monday 5/12 (code p207f-001)
check engine light back on tuesday 5/13
dealer ordered O2 sensor on thursday 5/15
O2 sensor to be replaced friday 5/16
Last edited by raunen; May 16, 2008 at 12:59 PM.
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Old Jan 11, 2022 | 08:03 PM
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Originally Posted by raunen
check engine light occurred on thursday 5/07
dealer replaced left catalyst on monday 5/12 (code p207f-001)
check engine light back on tuesday 5/13
dealer ordered O2 sensor on thursday 5/15
O2 sensor to be replaced friday 5/16
Did the o2 sensor fix your problem? Which one did you replace?
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