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How can I reset my '99 caddy sts's computer in order to pass my smog

I went to smog my '99 caddy sts and it failed the smog for 2 codes: P0488 and P1258, i wanted to know if there's any temporary way to clear those codes so that I can pass until I have the cash to repair my vehicle?

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  • Contributor
  • 13 Answers

You can use a code reader/coder clearer handheld device at any of the major auto dealers to clear the code. The device plugs into your dashboard on the left side of the steering wheel at the bottom.. Normally, you can clear the code and drive for about 15 minutes (maybe more if you are gentle on the gas) before the code appears again. These code readers cost about $80 to $100.

Posted on May 01, 2013

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SOURCE: Jetta failing smog due to non communication with OBD - Suggestions?

the no data error can be contributed to a bad interface cable or the scaqn tool was configured wrong and therfore could not connect to the ecm. I would recommend having a scan done again by a certiefied volkswagon tech chances are the mechanics used the wrong adapter cable or reader card. your smog problem could be that your evap canister is clogged therfore gives a bad reading.unfortunately you have to have a scan done but try an independant small shop that delas exclusively with foreign cars such as porche andd mercedez. the will have the correct scan tool and will be much cheaper than a dealership. your cost should be no more than 50 dollars US ... please rate this. thanks

Posted on Sep 23, 2008

txkjun
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SOURCE: Failed Smog Test - 4 codes for 2001 Isuzu Rodeo

Tune it up and replace the 02 sensor that keeps setting the codes bank 2 sensor 1. Have your oil and filter changed right before you go for a retest to. That will clear up 3 codes P0300, 0155 and 0154. You might have to replace the fuel sending unit to get rid of P0463 but if the gauge works OK I'd leave it alone.

Posted on Jan 12, 2009

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SOURCE: My 1996 oldsmobile cutlass supreem

Since you're asking about cost, and not about the technical details, I'll tell you that this recently happened with my wife's 1996 Olds 88, and I paid about $2,300 for a transmission rebuild. I believe that car has the same transmission as your Cutlass Supreme.

Whether you want to spend that much depends on the overall condition of the car (ours had only 50k miles) and the cost to replace it.

Of course that's the worst case scenario. If you take it to a good shop for a hands-on diagnosis, they might recommend a less expensive repair.

I had noticed the car seemed a little sluggish and occasionally shuddered just a little during a shift, but hadn't thought much about it until the light came on and the shop said it was a transmission trouble code. Performance is noticeably better after the rebuild.

Posted on Mar 15, 2009

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SOURCE: car passes emmission test but fails due to codes in computer

ok code 0300 is a random multiple cylinder misfire. probably ignition related is my guess. i would check the coil pack and ignition module and go from there.

Posted on Mar 16, 2009

  • 1 Answer

SOURCE: 1996 Nissan Maxima GXE Fail Smog Check Due To ECM System Failure

Working on one right now and hooked it up with a Snap On Solus scanner - It gives P0135 for 0/2 sensor bank 1 sensor 1. Check the 0/'2 sensor function and replace as necessary

Posted on Apr 14, 2009

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Did you disconnect the battery recently? Or have the car worked on to correct a check engine light problem? And they reset the codes?

When this happens (loss of all power or code reset), the computer will run all its tests on all systems, and set a 'ready' condition when the tests are passed. Some tests require multiple 'drive cycles' or specific conditions (less than full tank of gas but more than 1/4 tank) to complete the test. Until all (or a specific number - some non-critical tests may be exempted) tests are 'ready', the car will not be passed. The assumption being that until a test is successfully completed, the computer may discover a problem with a system, one that would fail the smog test.

If you're confident that all problems have been fixed, you need to run through enough drive cycles so the computer can complete all required tests. Most ODBII code readers can also read the readiness of the systems. And most parts stores will read your codes for you (and system status) or let you borrow a reader.

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