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Why wont mercedes c240 wont start after reconnecting new battery

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Replace Cabin Filter in my 2002 C240 Mercedes Benz

I have a 2002 C240 Mercedes and need to replace the cabin air filter. Problem, I don't know were it is located or how to replace it. Can you help me.

Posted on Mar 21, 2009

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gordanddar
  • 477 Answers

SOURCE: MY WILL NOT START THE CAR C240 MERCEDES BATTERY IS NOT DEAD

I am assuming that the engine won't even turn over. could be lots of different things. The simplist is to make sure the car in in PARK , won't start if not. Other things could be , Security imobilizer if you have one. Does your key have a electronic chip in it ? Try your other set of keys if you have one. Check if battery connections are clean and tight.

Posted on Jun 04, 2009

  • 14036 Answers

SOURCE: c240 mercedes wont start. after backing into a parking spot?

check for fuel pump operation.have someone turn ignition on while you go to rear of car where fuel tank is to listen for fuel pump operation.if not.check fuse and relay.if you hear fuel pump .check ignition system to make sure engine is getting spark.

Posted on Jun 06, 2009

  • 297 Answers

SOURCE: MERCEDES C240 WILL NOT START, ENGINE TURNS OVER,

Yup, either NO fuel or NO spark !!

Posted on Aug 11, 2009

jasperoni
  • 203 Answers

SOURCE: How To Change Oxygen Sensors in 2002 Mercedes C240 Sedan?

I do not know the part numbers but you have 4 sensors. 2 pre and 2 post catalytic converter. The pre sensors are the most sensitive and are generally the ones to fail. the rear sensors usually have a heater circuit problem. If your just replacing them for routine service interval I would just do the fronts. They connect to the engine wire harness in the front of the transmission pan. You may need an o2 sensor socket to remove the fronts. They are just a 22mm. in size.

Posted on Oct 18, 2009

Testimonial: "Thank you for the reply...I appreciate your time! Will replace front O2 sensors and see if check engine light goes out...thanks again...Jamie."

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1 Answer

I have a mercedes 2002 c240 and it wont start the fan comes on when i turn the switch. I thought it could be the engine control module or a fuse, not sure can you assist?


Hi Mate
Don't think to deep about the engine control module its highly unlikely, Check the battery connections are tight and confirm the battery voltage It would be best to connect a boost/jump battery
to confirm its not a simple low voltage battery, Dont rely on measuring the battery with a volt meter it could show 12v but under load will drop to below 9 and cause a non start

Dec 26, 2014 | 2002 Mercedes-Benz C-Class

1 Answer

After jump starting c240 and drove arround it wont engage reverse and now wont start


Brake ON and shift gear lever to N - neutral and try to start.

It can be a bad neutral safety switch.

Jan 17, 2014 | 2002 Mercedes-Benz C-Class

1 Answer

C240 mercedes key wont turn seems locked... I went to my car used fob doors unlocked when I tried starting i inserted the key in the ignition and the fob will not turn seems locked..now all of a sudden the...


I have a 2001 C240 with the same issue. I removed the positive battery cable from the battery and kept it off for 30 seconds then replaced it. Everything was reset and the key worked.

Jan 12, 2010 | 2001 Mercedes-Benz C-Class

2 Answers

My 2002 C240 will not crank


merc 220 wont turnover.new battery ignition lights come on then turn key nothing happens?

Jul 12, 2009 | 2002 Mercedes-Benz C-Class

1 Answer

C240 mercedes wont start. after backing into a parking spot?


check for fuel pump operation.have someone turn ignition on while you go to rear of car where fuel tank is to listen for fuel pump operation.if not.check fuse and relay.if you hear fuel pump .check ignition system to make sure engine is getting spark.

Jun 06, 2009 | Mercedes-Benz C230 Cars & Trucks

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