# My mpgs are suckingggg help!

**URL:** <https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445>\
**Category:** Shift518 Automotive\
**Created:** [April 18, 2012, 8:49am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445 "2012-04-18T08:49:02Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![usmc2801](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/usmc2801/32/6387_2.png) [@usmc2801](https://forums.speedlife.net/u/usmc2801)\
**Post date:** [April 18, 2012, 10:00am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/13 "2012-04-18T10:00:32Z")

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> [@FS: 18" ASA AR1's](https://forums.speedlife.net/t/fs-18-asa-ar1s/49202/4):
>
> Check eng is on for cat and 02, I’ll have CRC help with the filter. But I believe the 02 in the culprit

Well then you answered your own question LOL

Since you have codes for both the o2 and cat change both o2 sensors.

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