Okay this sucks...

Had a CEL a month or so back... bad 02 sensors and knock sensor. Changed my 02's and still had the CEL for the Knock sensor which I replaced on saturday.

Sunday when I turn the car on... boom CEL lights up again... this time 4 codes
0902- undefined maybe I'm just blind and misread it.. whatever
0304- how beautiful Knock Sensor again.. probably being tripped because of another code
1302 - Map/Baro switch which I cant find on the list since I'm not a donating member
The other I forgot but it was the Crank Sensor REF which is the one under the timing cover.

My question is... where do I go from here, I know its not my knock sensor and its only being tripped... Should I go for the crank sensor or the Map sensor????

 

Check for loose grounds. Thats what tripped my Crankshaft Ref sensor..and caused me to burn my starter up.

 

I'll check the grounds but it never gave me a problem starting

 

replacing the Crank ref could get rid of the KS, if you just replaced it then there is no way that it could have gone bad already.

there is another method via multi meter for check the KS to see if its truely fone bad.

 

DTC 0902
Diagnostic Trouble Code 0902 points to a problem with the Rear Heated Oxygen Sensor Heater.

The malfunction is detected when the current in the Oxygen Sensor heater circuit is out of the normal range.
Possible causes include ...
- the electrical harnesses
- the connector
- the Oxygen Sensor heaters

You may test the heater with an ohmmeter. This test is done with the engine off.

Raise the car and support it on sturdy jackstands. Slide under and disconnect the connector. Viewed with the connector latch at the 12 o'clock position, there are four terminals. They are numbered 1-2, top row, right to left and 3-4, bottom row, right to left. Be sure to measure the resistances of the Oxygen Sensor, not the harness which leads to the Engine Control Unit.

Measure the resistance between terminals 1 and 4.
The factory spec is 2.3-4.3 ohms at 77 degrees Fahrenheit.

Measure the resistance between terminals 2 and each of the other terminals.
The reading should be infinity (no connection).

Measure the resistance between terminals 3 and each of the other terminals.
The reading should be infinity (no connection).


Check fuse #31 (15 amps) in the passenger cabin fuse block. That fuse block has three columns of fuses.
The left-most column contains fuses 1 - 11, numbered from bottom to top.
The middle column contains fuses 12 - 26, numbered from bottom to top.
The right-most column contains fuses 27 - 40, numbered from bottom to top.

The numbers are molded into the plastic fuse block. They are not easy to read. A flashlight will be helpful.

 

PM your email addy and I will give you FSM info on 1302...

 

son of a b!tch I replaced both 02's a few weeks ago...

 

You probably replaced the left and right O2 sensors. That code is refering to the rear O2 sensor (the one in the cat).

 

You replaced hte rear one too? or just the front 2

 

ohhhhh


Damnit now I gotta change that one too. Now I'm even more pee'd.. I changed the 2 in the engine but not the one in the cat.

My car for some reason has been messed with ALOT. The previous owner had spliced the rear 02 sensor wires (the rear engine 02) and they had fallen apart and melted... I should've changed all 3 but when I saw that one in that condition I figured I'd change the 2 engine ones.

Okay so I guess I have to change the one in the CAT, but why the crank sensor and Map Sensor?

 

Got the email, thanks a million Kev