Check Engine Light Due to Improperly Manufactured Threads on Fuel Filler Pipe on Mazda RX-8

Some models may have a problem where the Check Engine light illuminates indicating an improperly tightened fuel cap. Due to improperly manufactured threads on the fuel filler pipe, the filler pipe may need to be replaced.

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Average mileage: 52,551 (13,500–104,000)
6 model years affected: 2004, 2006, 2007, 2008, more2009, 2010
12 people reported this problem
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problem details
2004 Mazda RX-8 20,000 mi,
been through 4 fuel caps so far.
2004 Mazda RX-8 104,000 mi,
Purchased a new official mazda rx8 gas cap
2007 Mazda RX-8 13,500 mi,
When I go to fill gas tank the filler cap is almost completely loose.
I had the check engine light come on, and they diagnosed it as gas cap. I had to buy a new gas cap.