Question about 1991 Mercedes-Benz 420

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1991 420 SEL Merecedes

Hva e had problems with the gas gage, the light comes on even when there is gas and the car will die, I drove it home and parked it one da, came outv the next morning and it showed no gas as teh light was on, and I put some gas in just in case, and it just turns over and does not start, it acted like it did at first, but just does not start at all, I'm thinking maybe a relay or fuse since it was an on goning problem with the lights and sensors???? What do you think?

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  • Mercedes-Benz Master
  • 2,925 Answers

Mercedes electrickery is complex and can be temperamental, plus it could have an anti-theft system to further complicate matters. It is entirely possible your car has more than one fault and possibly more than two...

Generally the fuel gauge and low fuel warning light has a separate circuit from the fuel pump even though mechanically they share the same space and could conceivably affect each other.

I suggest you put your preconceived ideas on the back burner and go back to basics. Check fuses, check supply voltages, check in the vehicle handbook whether there is an anti-theft system and so forth.

Posted on Jun 11, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 165 Answers

SOURCE: My car is not turning on!

Try to use other car key, (or replace the key batteries if u don,t have other one)

Posted on Apr 24, 2009

  • 58 Answers

SOURCE: 1991 Mercedes Blinker and hazzard lights light up but don't blink

Needs a New Flasher. This is located in the center console somewhat near the ashtray.

Posted on Jan 05, 2010

  • 58 Answers

SOURCE: FIRING ORDER OF 420 SEL MERCEDEZ BENZ 1991

15486372 With the number on thru 4 cylinders on the right bank and 5 thru 8 on the left bank as seen from the drivers seat.

Posted on Jan 05, 2010

iambanshee74
  • 3489 Answers

SOURCE: 1990 Mercedes Benz 420 SEL computer problem? wont

This could be caused by a faulty Crank position sensor. The computers are expensive for this and not something that commonly fails on these. Have the fuel pumpchecked for operation and pressure. Check for spark at the plugs. Then we can procede further if you would like.

Posted on May 22, 2010

ZJLimited
  • 17970 Answers

SOURCE: replacing the evaporator core in

You have a W126 S-Class Sedan
Chassis W126.035
Engine M116.965 V8
Model 420SEL
Years 1986-91
Horse Power 201
Weight 3850

other problems, is the oil dripping inside the car = evaporator core leaking.

You are correct, this is a very hard job.

This link will help you decide if you want to DIY:
Climate Control - W-126 Dash Removal - Evaporator Replacement

Hope helps.

Posted on Aug 16, 2010

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