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Smog Check Repair

2003 Mini Cooper Threw P0456 Trouble Code

2003 Mini Cooper S, Threw a P0456 trouble code. I checked the gas cap and the rubber seal. I noticed the seal around the gas cap was busted all the way around. I replaced the gas cap but I don't want to erase the trouble code (P0456) so I can see if the error pops up again.

Question, would it be better to wait until the trouble code clear on its own and the check engine light to go off by itself or should I clear the data and hope I can drive around enough for all tests to be performed before I get pulled over because of my registration which is expired needs a smog check so I can complete the registration process.

Any time data on the total tests or auto clear check engine light when the test for the P0456 code has been retested internally. Basically I need smog check quick and rather not reset all codes. Is there anything I can do to clear the code on its own.. like how many drive cycle, miles, trips, ect.. Thanks, Chris.


We'd recommend clearing the P0456 trouble code then driving your Mini Cooper at least through 2 drive cycles in order to reset the required emission monitors (which will be cleared when you manually erase the trouble code with your scan tool), and to see whether P0456 will reappear.

Follow the drive cycle below. Insure your Mini has between 1/4 and 3/4 full in the gas tank (the drive cycle will not start of fuel level is not within this range). Perform the drive cycle on public road ways at your own risk. It is highly recommend to perform the drive cycle on a dynamometer rather then on public roadways, as it might be difficult following the drive pattern in traffic.

1. Start engine and idle while cold for 2 minutes and 10 seconds.

2. Accelerate to 20-30 miles per hour and maintain steady speed for 3 minutes and 15 seconds.

3. Accelerate to 40-60 miles per hour and hold steady speed for 15 minutes.

4. Decelerate and come to a complete stop. Idle engine in gear for 5 minutes.

The drive cycle above will be terminated if engine RPM exceeds 3000 at anytime. Or if road speed exceeds 60 mph. Or if there are large fluctuations in throttle angle.

After performing the drive cycle at least twice, check for trouble codes and ensure all emission monitors are complete or "ready". If all is well, proceed to smog check.

posted by SmogTips Support 09-22-2014 10:39 AM

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