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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 52,551 (13,500–104,000)
6 model years affected: 2004, 2006, 2007, 2008, more2009, 2010
12 people reported this problem
Viewing 1 - 4 of 4 comments
been through 4 fuel caps so far.
Purchased a new official mazda rx8 gas cap
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.