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Old 03-11-2014, 01:35 AM   #1
Kirby10
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Member#: 300139
Join Date: Nov 2011
Chapter/Region: RMIC
Location: Colorado Springs
Vehicle:
2010 STi
Spark Silver

Default Would a bad front O2 sesnsor cause stumbling/hesitatiom

My car is a 2010 STI and was tuned by a great tuner. Car was tuned at 32k and is now at 60k. It was running great until all of a sudden it hesitated and stumbled badly at or above 3,000rpms please help
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Old 03-11-2014, 01:44 AM   #2
Kirby10
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Spark Silver

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Bump please help
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Old 03-11-2014, 01:45 AM   #3
BeastianSTI
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Could be - but it depends on the driving circumstances. If it stays in closed loop, then yes it would cause stumbling. If you're getting on it enough to throw it into open loop, as per the tune, then it could be something else. The front AFR sensor isn't used for open loop fueling adjustments.
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Old 03-11-2014, 02:14 AM   #4
DHRDAN
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01 2.5RS W/ EJ257
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Any codes?


If no codes... ask this "great tuner" of yours.
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Old 03-11-2014, 04:46 AM   #5
HinshawWRX
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Do not bump after 12 minutes at 1am. Let people read and respond. Common sense is talk to your great tuner.
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Old 03-11-2014, 11:40 AM   #6
ShawDizzle
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Yes it can but a lot of things can. You should be throwing a code for a bad o2. It could be going bad but not totally crapped out yet.

Also, what do you mean by stumble? Was it a stumbling as you were beginning to boost or was it a hard stumble almost like a fuel cut?
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