T9ja

Took my car to MB dealer. Diagnosed the car to have a bad O2 sensor on the left side and a blown fuse. Does a bad O2 sensor affect acceleration that bad on our cars? Asked the tech. for a fuse map, and was told they do not have one, so I can't locate the blown fuse. Anyone knows the location of the O2 sensor fuse.

jmb614

If it's a primary O2 sensor then yes, it may affect performance as it helps determine how the car is fueled (AFR).

T9ja

They told me it was the rear, driver's side o2 sensor that was fried. But will these affect the s/c from whining. Can't hear that whining sound anymore.

jmb614

Secondary O2 shouldn't affect performance. As far as the S/C whining are you aware of whether or not it is engaging? You have a few mods, I assume you are data logging? If so you should be able to see if you are getting boost.

Rocman8

I've never heard of an o2 sensor being fused. you might want to find out what fuse is actually blown.

cptncreme

The heated part of the O2 sensor is fused on most cars, but being a downstream sensor, shouldn't really effect performance

Rocman8

ahh yes the heater circuit is fused. the rear is strictly for emissions and would not affect performance.

T9ja

No, it does not engage as far as I know. Does not feel like the car is making any boost either.

jmb614

I believe the electro-magnetic clutch for the supercharger is fused. If that fuse is blown the S/C won't engage.

uraberg

what keeps you from getting the little bluetooth adapter, and finally start logging? Your problems have been going on long enough, but you keep being half assed about addressing it. There is no need for misinformation and guesswork. The adapter costs maybe $7.

what do you mean, can't locate the fuse? what keeps you from checking ALL the fuses?

Denroll

Pop the fuse panel on the left side of the dash. There should be a fuse map folded up and stuck in there.

T9ja

And where can one get this from? I stated, I need to get the exhaust fixed first before I do anything else, but that didn't fix the problem, and that's why I took it to the dealer for more diagnosis. Is not as if I'm home 24/7. I know where the fuse boxes are. Just want to know which of the boxes should I concentrate on, because they do not have a diagram for all the fuses.

T9ja

Is the fuse box for that located under the hood or driver's side?

jmb614

That I do not know unfortunately. Denroll or someone more knowledgeable on that than myself may chime in.

Here's a couple fuse charts that may help:
Fuse Assignment of Fuse and Relay Box in Engine Compartment, Left





Fuse 43 - 51, Up To 3/20/03



Fuse 51 - 67, Up To 3/20/03




Fuse 43-49, As Of 3/21/03 - Up To 8/31/03



Fuse 49 - 64, As Of 3/21/03 - Up To 8/31/03



Fuse 64 - 67, As Of 3/21/03 - Up To 8/31/03




Fuse 43 - 45, As Of 9/1/03 - Up To 5/31/05



Fuse 46 - 57, As Of 9/1/03 - Up To 5/31/05



Fuse 58 - 67, As Of 9/1/03 - Up To 5/31/05




Fuse 43 - 45, As Of 6/1/05



Fuse 46 - 57, As Of 6/1/05



Fuse 58 - 67, As Of 6/1/05



Fuse Assignment of Fuse Box in Interior Compartment on Driver's Side





Fuse 21 - 33, Up To 3/20/03



Fuse 34 - 42, Up To 3/20/03




Fuse 21 - 30, As Of 3/21/03 - Up To 8/31/03



Fuse 31 - 42, As Of 3/21/03 - Up To 8/31/03




Fuse 21 - 29, As Of 9/1/03 - Up To 5/31/05



Fuse 30 - 42, As Of 9/1/03 - Up To 5/31/05




Fuse 21 - 28, As Of 6/1/05



Fuse 29 - 42, As Of 6/1/05



Fuse Assignment of Fuse and Relay Box in Trunk





Fuse 1 - 15, Up To 3/20/03



Fuse 15 - 20, Up To 3/20/03




Fuse 1 - 6, As Of 3/21/03 - Up To 5/31/05



Fuse 7 - 20, As Of 3/21/03 - Up To 5/31/05




Fuse 1 - 4, As Of 6/1/05



Fuse 4 - 20, As Of 6/1/05



Fuse Assignment of Front Prefuse Box





Fuse 68 - 77, Up To 5/31/05




Fuse 68 - 77, As Of 6/1/05



Fuse Assignment of Rear Prefuse Box





Fuse 78 - 90, Up To 3/21/03



Fuse 91, Up To 3/21/03




Fuse 78 - 86, As Of 3/21/03 - Up To 8/31/03



Fuse 86 - 91, As Of 3/21/03 - Up To 8/31/03




Fuse 78 - 86, As Of 9/1/03 - Up To 5/31/05



Fuse 86 - 91, As Of 9/1/03 - Up To 5/31/05




Fuse 78 - 85, As Of 6/1/05



Fuse 85 - 91, As Of 6/1/05

T9ja

Thanks jbm614. You are the man? Problem solved. I looked under the hood fuse box, and found out that a 15 and 25 amps fuse were blown. Replaced them, start the car, rev it up a bit, re-check blown fuses and discovered that the 15 amps fuse I just replaced was blown again so I used a 20 amps instead. Now my car is back to its beastly mode. Thank all. I love these forum. Very knowledgeable.

T9ja

I think we need a sticky tread for if s/c not engaging, things to check for vs if it engages then stop engaging. This will narrow down the list of things to check for, and reduces questions on these matter. Just a thought.

uraberg

Good luck with that.

jmb614

There's a reason you are blowing fuses. I would find that reason and resolve it. Placing a larger fuse on the circuit is asking for trouble, there's a reason why fuses have differing amperage ratings.