engine check light came on whenever i got in my car after it being off for about 20 minutes(the car was off and the light wasnt on before). So the question is...what exactly is the engine check telling me? To check my engine...thats a pretty general area for a problem to be.
i dont know anything bout 02 sensors going out or something, so if anyone has any suggestions as to what to do about the engine check light, let me know please.
thanks.,

 

wow read the stickies please the light can be any number of codes and they are easy to check

 

will do..ive never fallen victim of not reading the stickies first, sorry

 

go to a dealership or autoparts store, the second option is probably cheaper

 

i got the codes 0707 and 0304
which have concluded to be
for 0707- rear heated 02 sensor
and 0304- knock sensor
considering i know nothing about any of this, what do i do now?

 

and why did all of this immediately pop up. 2 problems at once. wouldnt one go before the other?

 

The two have nothing in common. 0304 basically means your knock sensor pooped, therefore its running in 'safe mode' timing so you're basically not getting the advertised 190bhp. The 0304 code is also a ghost code, which means that it more than likely showed up previously and stayed there, but it doesn't trigger a Check Engine Light (CEL)

The 0707 code will trigger a CEL light. According to the FAQ, it looks as though this sensor keeps tabs on the Catalytic convertor. So the problem can either be a faulty sensor, or a clogged and faulty Catalytic convertor.

 

how do i know if the 0304 code is ghost or not? i guess im just going to tell my mechanic about it and have him check it out. wahts "bhp" you mean horsepower? i dont want to be robbed of hp!

 

'Ghost Code' or hidden code, basically means that its a stored error code in the ECU, evidence by you being able to pull it doing a self-diagnosis, BUT it doesn't trigger a CEL light. CEL lights are only triggered if it effects emissions. Since the 0707 code is related to emissions, the CEL light was triggered.

BHP=Brake Horsepower, or crank horsepower.

 

My ECU gave me:
04 07 Crankshaft Position Sensor
07 03 3 Way Catalyst (left bank)

Can anyone tell me what / where these are and what they do?

95 max 3.0

 

Crankshaft Position Sensor consists of a permanent magnet, core and coil. It detects the fluctuation of engine revolutions and is located near the transaxle facing the teeths of the flywheel. Its looks like a simple installion, as you just sensor mounting bolts, take it out, and put in the new sensor and connect it to the harness.

Regarding anything with the 3-way catalyst, unless you know what you're doing, I wouldn't touch it.

 

okay i understand so all i have to worry about is the rear heated 02 sensor, whatexactly is that?

 

Well if you want your car to be healthy, you'd worry about both

 

i do, i thought it was a ghost code???
so wahts a rear heated 02 sensor?

 

A ghost code is just a stored code, it means the ECU recognises the code but since a KS isn't emissions related, it doesn't flash a CEL light. It still means the sensor is faulty, therefore the ignition mapping is set in safe mode.

According to the FAQ, it looks as though the rear O2 sensor keeps tabs on the Catalytic convertor. So the problem can either be a faulty sensor, or a clogged and faulty Catalytic convertor.

 

okay well, im pretty novice with all this stuff so i'll most likely see if my mechanic knows anything about it. hopefully its not too pricey.
thanks for your help.

 

If your mechanic follows a FSM, Chilton, or Haynes manual directions step-by-step on the Knock Sensor replacement, be prepared to pay a pretty penny

No problem on the help.

 

Anyone know where I can find instructions on replacing a Crankshaft Position Sensor for my 95 maxima?