20 Most Recent 2004 Mercedes-Benz C-Class Questions & Answers


run the fault codes
indicators are that the heated oxygen sensor ( in the exhaust manifold before the cat converter ) is malfunctioning and not reporting the exhaust gas composition correctly so that the ECM can adjust the mixture
other codes that may show up are the ambient air temp sensor , The BARO sensor and MAF/VAF sensors all of which report to the ECM to keep the air /fuel mixture correct

2004... | Answered on Dec 12, 2017


This could be anything in between. Heres where I would start. DOES the vehicle spray water in any other speed? Do all speeds work?
If all speeds work fine the problem could be in the SENSOR controlling the actual Spray pump. NOT worth fixing. OR your wires going to the spray pump could be cut! Check the resistance real quick between the pump and the sensor. It also may be the culprit.

2004... | Answered on Dec 12, 2017


unlikely to be engine oil, more likely transmission oil from faulty transmission oil cooler in radiator tank
take it in for a proper diagnosis and quote
the coolant system will have to be properly and completely flushed

2004... | Answered on Oct 24, 2016


stop and ask someone the way ,these modern cars are too much for this old dinasaur .Try asking a young mechanic in a garage somewhere they will know for sure

2004... | Answered on Sep 27, 2016


I'm not familiar with the Mercedes, but first of all, NEVER turn your wheels all the way, it'll cause damage sooner or later, you kind of found this out already. Next, try getting to the fuse center under the dash and probably under the hood of the car, check all your fuses with a digital volt meter, replace any that are bad.

Your last statement is "won't start" does the engine spin? or nothing at all happens when you turn the key? If your sure the battery connections are all tight and clean the next step I would do is plug an OBD II scanner in and get any codes that have popped up in your computer, if there aren't any, then my next suggestion would be to start checking into the ignition system, If you forced you key to turn in anyway when you had your wheels locked to the side, you could have damaged the electro-mechanical components in the steering column.

2004... | Answered on Jul 19, 2016


look for broken/loose wires/connections around the tank while someone else is observing the fuel gauge. a broken/loose ground could be at fault. the fuel sending unit sends the signal to the gauge, also, look for broken/loose wires/connections from the fuel tank to the fuel gauge if you haven't found the problem yet. if all else fais, ground the body with a temporary connection to see if that is good, body ground is needed to keep them running good.

2004... | Answered on Apr 26, 2016


Unfortunately, you need to get it scanned. Merc. charge for this + labour in the UK.
i had a problem with an old SLK and found the software onFleaBay, it worked out cheaper for me.
Check out the Merc forums on line, very helpful.
it could well be a sensor, modern cars eh!

2004... | Answered on Aug 07, 2015


normally held on with a number of bolts a row under the bonnet some behind the door when you open door you will see 1 then there will be 1 at the rear bottom of the wing under some trim and there will be 1 either behind the indicator light or behind the bumper

2004... | Answered on May 14, 2015


Problem is usually a failed spring in the parking brake pedal mechanism. Only fix I know of is replacement of the pedal assembly. Also make sure your brake fluid level is ok. Low fluid will give you the same light.

2004... | Answered on Mar 02, 2015


My best guess is that the remote is going bad or the receiver sensor in your car is getting goofy. But my money is on the remote itself. It's been used and banged around for 10 years and the inner workings just plain wear out. Just found out the average life span of a tv/cable DVR box is 2-3 years.

2004... | Answered on Nov 27, 2014


headlight switch is usually the cause for this.

2004... | Answered on Sep 22, 2014


P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.
Thanks.

2004... | Answered on Aug 31, 2014


I am not certain if you mean actually moves forward, as in out of gear, kind of rattles with movement or the shifter knob itself is moving up and down. I am a former Mercedes Benz Tech and have worked with many of those shifters in various MB classes. If you provide a better description, I will be able to help you.

If the shifter has excessive play in it, there is a grommet that connects the shifter to the linkage to the transmission that wears out and will cause a light rattle sound and play in the shifter. Again without a better description, it is difficult to help you.

2004... | Answered on Aug 02, 2014


Check power board in your trunk its what your fuses or in

2004... | Answered on May 17, 2014

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