check engine light on... help?

[Seanzyyy]

well,i have a 1997 240sx and the check engine light is on for a few codes...

i need this fixed so i can pass emissions...

knock sensor and o2 sensor...

i can get a new o2 sensor for around 40-50 but the knock sensor pushes over 100...

would cleaning them have a chance of them reading as ok?

if i changed the o2 sensor, would it affect whether or not the knock sensor shows up on the codes?

[maj Andres]

No bulb, no problem. Right?

[maj Andres]

NVM, if it's OBDII (96 and up) they will plug the smog machine into the diagostics connector. At least iin callifornia.

[1996N1ss@n240SX]

NVM, if it's OBDII (96 and up) they will plug the smog machine into the diagostics connector. At least iin callifornia.

all you guys in states where u have emissions testing and car inspections must really suck...im in florida....not cat converter.....and dont car what i put in my car cause cops or the govt. does test my car

[1996N1ss@n240SX]

all you guys in states where u have emissions testing and car inspections must really suck...im in florida....not cat converter.....and dont car what i put in my car cause cops or the govt. does test my car

doesnt*

[blacksrjdm]

well,i have a 1997 240sx and the check engine light is on for a few codes...

i need this fixed so i can pass emissions...

knock sensor and o2 sensor...

i can get a new o2 sensor for around 40-50 but the knock sensor pushes over 100...

would cleaning them have a chance of them reading as ok?

if i changed the o2 sensor, would it affect whether or not the knock sensor shows up on the codes?

Knock sensor is a dummy code. Replace the O2 sensor and clear the codes. Problem solved.

If you have a knock sensor code then your engine computor detected a knock at some point and set the knock code. Knock sensor codes are 99% of the time a dummy code that should let the tech know that the engine had a knock at some point in time. It could be that you need spark plugs, could be that you got bad gas once.

[blacksrjdm]

Next time search... Took that statement right form another knock sensor post.

[YuNg1's_240sx]

that knock sensor you can pull out of any ka24de engine. The good part is they can be bought for like $6 at a j yard. Mine was cracked. It really did improve engine performance when i replaced mine. It went through the gears soooo much smoother. It really is worth it, but the bad part about it is putting it in! I had to bend the fuel pipe and ever since I have been getting the occasional fuel smell. But no fuel is leaking, i made sure of that because I wouldn't want the car on fire! But just get them from the j yard, if they are faulty, you only wasted a 10. If you are taking out the intake manifold, this would be the time to get the knock sensor replaced.

[blacksrjdm]

Being that it was cracked, That is the only reason to replace the knock sensor. The knock sensor is specifically a microphone for the computer to detect an isolated knock. May have only knocked for 2 seconds 1 time and it will set the knock sensor code telling you that there is another issue. Seeing that the OP has an o2 code, the o2 is the issue, not the knock sensor. I speak from experience and also as a nissan tech.

[Seanzyyy]

thanks guys.

i think i'll clean the knock sensor up first and check..i'd feel better if i bought a new o2 sensor lol

and i also have code P0446... idk what that is?i figure it'll be cleared up by the o2 sensor and/or the knock sensor

[blacksrjdm]

U didnt read my posts did you? Do the O2 sensor and then clear the codes.

[Seanzyyy]

yea, i kinda skimmed the posts... hahai'll do that, thanks