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Posted: 6/3/2010 5:48:18 PM EDT
Sorry if the above phrase is worded odd...

Anyways, he drives a 1997 Nissan 200 SX-SER.

They said the diagnostic tool said that the following things were bad:

o2 Circuit (Bank 1, Sensor 1)

Knock Sensor 1 Circuit (Bank 1)

Could someone fill me in as to what those sensors do and how vital they are?

And could you estimate the repair fees?

Much, much appreciated to those of whom can help.
Link Posted: 6/3/2010 5:52:14 PM EDT
As I understand it, the computer gives you a general system/area to look and that proper diagnostics require troubleshooting to find the defective component(s). Sounds like someone just read the codes on the machine and didn't determine what is actually causing the problems.
Link Posted: 6/3/2010 5:56:47 PM EDT
I will see if I can get a halfway decent picture of the printout and post it up.

May not get to it tonight, but I will have it up tomorrow.
Link Posted: 6/3/2010 6:00:39 PM EDT
[Last Edit: 6/3/2010 6:03:16 PM EDT by 50cal_Mopar]
o2 needs to be replaced. Could cause running issues, fuel mileage going to crap, possible damage to catalytic converter. Sensor 1 is located before the catalytic converter.
Knock sensor...did they say how many hits it had? Its not too uncommon for a knock sensor to get a hiccup. Actually happened to me 20k miles ago, I reset it and still no issues with it.

ETA- o2 sensor could be $50-$120 aftermarket. It should be easy, you could do it with a wrench in your driveway. DONT BUY A UNIVERSAL SENSOR

I dont remember the exact layout of the exhaust on those.

Link Posted: 6/3/2010 6:06:52 PM EDT
My wife has a 97 200-SX and we long ago gave up on new sensors (after half a dozen under warranty), they just continue to go bad.  We just ignore the light anymore.  I know there's oil in it and it keeps running and I can read the other gauges so FIDO. The light will go out when it's cold and comes back on when it's warm (weather that is).  You can reset it by disconnecting the battery, but when the weather warms up it'll just come back on.

YMMV and good luck.
Link Posted: 6/4/2010 7:23:47 AM EDT
Wow, lots of helpful information, thanks a ton guys.

I will have to show the old man this thread later on today.
Link Posted: 6/4/2010 7:46:40 AM EDT
If the engine uses two O2 sensors (most do) then I would advise getting them both replaced.

It's possible that the knock sensor fault is related to the bad O2 sensor.
Link Posted: 6/4/2010 9:05:39 AM EDT
Link Posted: 6/4/2010 7:22:22 PM EDT
Originally Posted By Quintin:
Before replacing anything, specifically what codes were present?  The specific code number?

Don't remember.

I'll look at the sheet again and get back to you on that one.
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