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2 weeks ago - CEL, code P0172 (lean), mechanic changed PCV. Codes cleared, light back on in 2 days. Code P0175 (rich), vacuum leak detected and fixed, codes cleared. 3 days later, light back on.

Over last weekend car stalled on highway after I took foot off gas. Kept rough idle / stalling at every other red light and stop sign until I reached the mechanic. p0175 AGAIN.

Yesterday, he had car for whole day. Cleaned throttle body, the MAF, re-checked for any vacuum leaks, verified fuel pressure normal. Cleared codes with battery cables off for 1 hour. Took home car last night.

Today, no stalling or rough idle, car back to 100%. 15 miles into drive to my office, CEL back on. NO ROUGH IDLE, NO STALLS, NOTHING. code is p0175 still.

Anybody have any clue beyond getting a new car?! :)
 

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2 weeks ago - CEL, code P0172 (lean), mechanic changed PCV. Codes cleared, light back on in 2 days. Code P0175 (rich), vacuum leak detected and fixed, codes cleared. 3 days later, light back on.

Over last weekend car stalled on highway after I took foot off gas. Kept rough idle / stalling at every other red light and stop sign until I reached the mechanic. p0175 AGAIN.

Yesterday, he had car for whole day. Cleaned throttle body, the MAF, re-checked for any vacuum leaks, verified fuel pressure normal. Cleared codes with battery cables off for 1 hour. Took home car last night.

Today, no stalling or rough idle, car back to 100%. 15 miles into drive to my office, CEL back on. NO ROUGH IDLE, NO STALLS, NOTHING. code is p0175 still.

Anybody have any clue beyond getting a new car?! :)
Been driving my 2010 T6 for 15 months from 46K to 59K miles... nothing like this going on. Mostly highway driving. Mileage on your car? Easy to imagine how frustrating this must be.
 
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