How long before codes clear from memory? - Pontiac G6 Forum
 
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post #1 of 4 (permalink) Old 06-08-2019, 08:42 AM Thread Starter
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How long before codes clear from memory?

Trying to get my daughter's car to pass emissions inspection. We replaced the catalytic converter and cleared the 'check engine' codes using the Torque app. The auto technician at the inspection station said it would either be a certain number of on-off cycles or miles before he could reevaluate whether codes had truly cleared from memory.

Does anyone know with regard to the 2007 G6 2.4 how many miles it'll need to be driven before I can take it back to the inspection station and have it pass?

80,521 miles currently.
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post #2 of 4 (permalink) Old 06-08-2019, 11:16 AM
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Here ya go. I usually drive to and from work every day for a week and it’s usually ready. They will test if you still have one monitor that’s not ready.

A complete driving cycle should perform diagnostics on all systems. A complete driving cycle can be done in under fifteen minutes.

To perform an OBDII Driving cycle do the following:

Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50C (122F) and within 6C (11F) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.

Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.

Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.

Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.

Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.

Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.

Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.

Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

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Last edited by waterfowler76; 06-08-2019 at 11:18 AM.
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post #3 of 4 (permalink) Old 06-08-2019, 07:15 PM Thread Starter
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Wow, I had no idea so much was involved. Thank you!
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post #4 of 4 (permalink) Old 06-13-2019, 04:50 AM
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I have been having an engine light problem for the last 4 years. I usually have to drive my car (2007 g6 2.4) around 125 miles before everything clears.
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