How do you clear an SES light?
2. Pull PCM BAT and PCM IGN fuses in engine compartment.
3. Wait a few minutes.
4. Turn ignition off.
5. Replace fuses.
It will take the car a while to relearn the fuel and timing curves so don't worry about a temporary performance loss.
http://www.ls1.com/index_faq.html#1002
I had to use it several times myself before I had EFILive and LS1edit with no problems. I understood the key had to be on for the pcm to reset completely.?.?
every time you manually delete error codes ( or reomve battery) you also are forcing all I/M 240 smog tests back to a incomplete ( failed) state.
Some may take as many as 40 valid drive cycles to get backed to a complete state.
This does put a burden on the PCM for the tests that run constant (when engine is running) will take up some process time.
Also if course if you have to go in for a smog test and they do I/M 240 tests, instead of 1 test being in a failed state several now could be due to the erase you forced.
EPA linked deleting DTC error codes to resetting tests to fail so people did not try and pull a fast one by clearing codes just before doing a smog test.
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From a cold start, I let it idle up to operating temperature and then after I have driven 20 or 30 miles, my car will past emissions test


