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Old 08-15-2002, 10:14 PM   #1
Satman53
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Default Recalibrate o2 Sensor?

I have been reading the post here off and on for several months and enjoy the site very much.

I am happy to report my wife and I have driven over 112000 miles in our '97 SL2 with no major problems.

Recently, I purchased a code reader and the code for the front o2 sensor is displayed.

A friend told me my dealer will have to install a new front o2 sensor, because the onboard computer will need to be recalibrated.

I have enjoyed reading about replacing the sensor in '95 SL2's on this site, but my '97 has OBD II diagnostics. Is there a major difference in replacing the o2 sensor? The code reader will erase the code, but will not recalibrate the onboard computer as far as I know.

Suggestions!! Thanks...Satman53

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Old 08-16-2002, 06:19 AM   #2
Heartbeat - '95 SL2
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I *think* that once the code is cleared, and the new O2 sensor is sending data within spec to the PCM (computer), that everything will function normally. You may want to check out a Chilton manual to see the procedures for replacing the sensor.

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Old 08-16-2002, 07:45 AM   #3
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the front o2 sensor in the 95 and 97 are the same and replacing it will make the car run better if the old one was bad. fuel mileage may slightly improve if it was bad before from a slow reacting o2 sensor. replacing the sensor is easy! you need an a 8mm and a 19mm wrench. disconnect the negative cable from the battery first. unplug the o2 sensor and unscrew it. screw in the new one. plug it in. reconnect the battery cable. that's it. make sure the exhaust manifold is COLD before you start.

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Old 08-16-2002, 08:29 AM   #4
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Idea Re: Recalibrate o2 Sensor?

Quote:
Originally posted by Satman53
my '97 has OBD II diagnostics. Is there a major difference in replacing the o2 sensor? The code reader will erase the code, but will not recalibrate the onboard computer as far as I know.
Your '97 OBD II has one more O2 sensor in the downstream pipe area (at the Cat. convertor). Like other mentioned, the 1st O2 sensor at the manifold is the same in OBD I system. I **Believe** there's no need to do any PCM recalibration as long as both two O2 sensors are functioning within spec. since the PCM is getting the voltage feeds continuously from both of them.

Btw, do you really need to replace the O2? Code is set and the SES light turns on? The downstream O2 sensor is nearly double the price to buy than the manifold one. :o:

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Old 08-16-2002, 09:06 AM   #5
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Default Front O 2 Sensor

Glara:

Quote:
do you really need to replace the O2? Code is set and the SES light turns on?
In my case, the O2 was causing the systme to cycle open then closed loop every 5 to 10 seconds, but did not set off a light/code. Upon examination, the sensor did not "appear" to be deffective, but up replacement, new unit working perfectly.

...
> 95 SL 2 = 649,619 Miles 40.4 MPG, as of 4/19/11. My manual Radiator Fan Switch, courtesy of Wolfman's patient installation guidance, continues to be.......invaluable <

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Old 08-16-2002, 08:59 PM   #6
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Quote:
Originally posted by Heartbeat - '95 SL2
I *think* that once the code is cleared, and the new O2 sensor is sending data within spec to the PCM (computer), that everything will function normally. You may want to check out a Chilton manual to see the procedures for replacing the sensor.
Thanks,

I checked the specs in the Haynes Manual. The sensor seems to be within specs. I'll keep an eye on the codes.

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Old 08-16-2002, 09:04 PM   #7
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Quote:
Originally posted by eRic 96sc2
you need an a 8mm and a 19mm wrench. disconnect the negative cable from the battery first. unplug the o2 sensor and unscrew it. screw in the new one. plug it in. reconnect the battery cable. that's it. make sure the exhaust manifold is COLD before you start.
Thanks for your reply,

I knew exactly which wrench to use when I disconnected the battery this afternoon to check the sensor with the volt meter!

Satman53

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Old 08-16-2002, 09:11 PM   #8
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Default Re: Re: Recalibrate o2 Sensor?

Quote:
Originally posted by qlara


Your '97 OBD II has one more O2 sensor in the downstream pipe area (at the Cat. convertor). Like other mentioned, the 1st O2 sensor at the manifold is the same in OBD I system. I **Believe** there's no need to do any PCM recalibration as long as both two O2 sensors are functioning within spec. since the PCM is getting the voltage feeds continuously from both of them.

Btw, do you really need to replace the O2? Code is set and the SES light turns on? The downstream O2 sensor is nearly double the price to buy than the manifold one. :o:
Thanks for your reply, I wasn't sure if the front sensor was the same as the OBD I, I have read about on this site.

The SES light is now off (has been on and off) the specs on the sensor seem OK. When I disconnected the battery, the code was erased. I'll keep an eye on it with my new, handy code reader.

Satman53

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Old 08-16-2002, 09:16 PM   #9
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Default Re: Front O 2 Sensor

Quote:
Originally posted by Luke
Glara:



In my case, the O2 was causing the systme to cycle open then closed loop every 5 to 10 seconds, but did not set off a light/code. Upon examination, the sensor did not "appear" to be deffective, but up replacement, new unit working perfectly.
Wow, I'm not sure how to check my sensor for this particular situation. If I remember correctly, you have a '95 model?

I don't think I can perform the jumper test with the OBD II system (according to Hayes). I will probably buy a Chilton manual in the near future to add to my library.

Thanks for taking the time to reply.

Satman53

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Old 08-16-2002, 09:18 PM   #10
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where did u get the code reader and how much was it?

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Old 08-16-2002, 09:33 PM   #11
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Quote:
Originally posted by swoker183
where did u get the code reader and how much was it?
Thanks for the question.

I bought the reader at Sears, they seem to have a decent return policy. The reader is an Actron OBD II diagnostic tester. The cost was a little on the high side for me (around $150 to $170 --- I can't locate the receipt at the moment), but maybe it will pay for itself in the long run.

I have never regretted buying a good tool!

No, I dont work for Sears or Actron.

Good luck!

Satman53

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Old 08-17-2002, 03:15 AM   #12
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With OBDII, I don't think you can check open/closed loop cycles like those of us with OBDI. Yes, Luke and I have 95 SL2s, the last year with OBDI. We can check codes by jumping the terminals of the OBD port with the ignition ON, and with the engine running, we can check the open/closed loops.

If you have a fancy enough code reader, I think info such as this, on-the-fly engine diagnostics and stats, will be fed by the OBDII port. Try reading the Chilton guide and your instruction manual -- maybe if it's not too late, you can return the code reader and upgrade if need be.

David just posted the 91-95 method of checking codes with a paper clip jumping the terminals:

http://www.saturnfans.com/forums/sho...0&pagenumber=3

Last edited by Heartbeat - '95 SL2; 08-17-2002 at 03:20 AM..

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Old 08-17-2002, 08:38 PM   #13
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Default Diagnostics

Quote:
Originally posted by Heartbeat - '95 SL2
-- maybe if it's not too late, you can return the code reader and upgrade if need be.



http://www.saturnfans.com/forums/sho...0&pagenumber=3
Thanks Heartbeat,

That's a great idea. I will do my homework and research code scanners with more diagnostic capabilities.

Satman53

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Old 08-18-2002, 11:08 AM   #14
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Quote:
Originally posted by Satman53

I bought the reader at Sears, they seem to have a decent return policy. The reader is an Actron OBD II diagnostic tester. The cost was a little on the high side for me (around $150 to $170 --- I can't locate the receipt at the moment), but maybe it will pay for itself in the long run.
i looked it up and it is $169.99 at Sears

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