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How To Pass a Smog Check
Edmunds.com
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How To Pass a Smog Check
Here are the most important steps in getting your car ready for a smog inspection.
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This article falls short in several places, especially when the suggestion is made to simply replace the O2 (or air/fuel) sensors without really proving that they are beginning to fail, or have failed. Plus the first tip about clearing the check engine light can easily be interpreted as simply clearing the code. When the system generates a trouble code, there is a lot more data stored than just the code that a technician needs to access as part of the diagnostic routine. Anytime someone clears codes, that other data is also reset and that can make any future diagnostics require more than one failure event to get to identify all of the vehicle problems.
Emissions testing of course can be inconvenient, but the best course of action is to simply have the car tested as is, and then have it repaired if necessary. If you keep your car properly maintained, and have any MILs dealt with when they occur instead of putting it off until an inspection has to be performed then the likelyhood of failure of an emissions test will be reduced as much as it possibly can. Virtually none of the other suggestions in this article will make much of a difference, and in fact some of them could cause a consumer more trouble.
Next time instead of talking to CarMD, AAA, and such, talk to people like Mike McCarthy, Jim Kemper, or ask me to give you contacts for real top techs, I'll be happy to help.
Any other commentary on this or other articles I'll keep on the forum "A Mechanics Life" here. Our jobs are difficult enough without haviing to constantly overcome bad advice too.
http://townhall-talk.edmunds.com/WebX/.f258f92?displayRecent
On the second try, it failed yet again but for a new reason. The printout showed a code and description that read "Insufficient Coolant Temp for Stable Operation". A quick search showed that the thermostat is known to stick OPEN in models with my 2.3L engine. I had only dealt with thermostats that wouldn't open and I realized that when the engine overheated. So I replaced the thermostat and drove it pretty hard for about 125 miles. It finally passed!!!
Johnny