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I have a 2002 ml320 just reached 180k. A couple of days ago I installed new downstream 02 sensor. The install was easy but I might have made a rookie mistake trying to test the old 02 sensor with multimeter and key in position 2. It had no charge so I took the key out and took the old sensor off and replaced it with the new one.
When trying to start the car it just clicked and instead of the battery icon on the dash I got the srs light.. I then tried to do the ecu reset using the gas pedal technique a few times but it didn’t work, my aftermarket radio comes on in position 1 then it starts blinking in and out. I tried charging the battery then the car started but after a few minutes the radio went out and abs, srs, esp, and bas lights all came on smh. When I turned the truck off it wouldn’t start again and now the instrument cluster only shows the battery icon and srs light.
I went out and purchased a $300 scanner but of course it wasn’t the srs scan wouldn’t work. Any suggestions, I’m really trying to avoid the dealership.
I disconnected the battery to see if the computer will remember things but I think that made it worse. Windows don’t work, locks don’t work, but inside lights still come on. Here are some of the codes I got. I’m lost in the sauce.
Thank you for replying. I got a code for a bad downstream 02 sensor.
I took the battery to Autozone it was dead, put new battery in and srs light went off but battery light is still on. Everything seems to work, it’s actually driving better than before but I’m getting .3 voltage coming from instrument cluster/air conditioning fuse on passenger side fuse box. I’m trying to determine where battery drain is coming from and that’s all I found. I’m about to run an alternator test.
thank you so much for your advice on erasing codes.
How did you determine that the battery was no good? If the battery was good before you changed the O2 sensor, how did the battery become mysteriously bad?
I didn’t do a battery check before installing the new 02 sensor. I just followed the scan reading to terminal 1 and bank 2. When the car wouldn’t start I got the battery tested and it was bad. The new battery started the car but another scan said there was a charging problem so I had the alternator tested and it was bad too. I just finished putting the new alternator in and so far so good.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
