Question about 1999 Mercedes-Benz E-Class
Sometimes it a weak relay for fan
Posted on Nov 22, 2013
Testimonial: "yes it is and when temperature over 80 showing on the screen check engine fan"
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Posted on Jan 02, 2017
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."
Probably two separate problems.
For the blower motor, it may be that the bearings are getting old and so the motor is getting harder to turn and overheating. A way to check is to take the motor out (it will be tucked in behind the glovebox. Pour a tablespoon of motor oil into the vents next to the shaft and work it back and forth to loosen it up. Then put the motor back in and try it. If I'm right, the motor will work normally again. However, this is only temporary--once the oil gets worn off the bearings in a while it will start quitting again. You should order a replacement before it blows your resistor block or (in the worst case) starts a fire. You can get them online, like from autopartswarehouse.com
Posted on Feb 27, 2010
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