P0171

**K Kraziee** · 06-08-2014

I keep getting this code. Could it be my O2 sensor? Car drives normal.

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**Fivefingerdeathpunch** · 06-08-2014

Thats a vacuum leak code.

I'd try and find the leak with a smoke machine. Or switch back to a stock throttle body and maf data.

**FordMan77** · 06-08-2014

Usually this is a vacuum leak somewhere. I've been fighting this code for a while now too, and my car drives fine as well. Replaced my upstream 02 (was old as whatnot, so figured it was time anyways), and still have the code. No vac leaks that I can find. I've even pulled the EGR tube and found it to be airtight, and sealed both ends. I think I'm about to have it smoked to see if I have a leak somewhere that I can't find. Tired of the damn CEL.

**K Kraziee** · 06-08-2014

Ya, it's been coming on and off for awhile and actually when it came on today, I just did the egr block off with a dime and quarter and the quarter moved so I just put the egr valve back on. Possibly I didn't tighten it enough? I cleared the code, drove for a good 20 miles today and it came back on so I'll probably have to just try to tighten it down real good. Also my boost gauge reads normal vacuum as well.

**BillBoost37** · 06-09-2014

I have also seen corroded battery cables cause this issue.

This should not be an O2 sensor.

**K Kraziee** · 06-09-2014

Well I tightend my egr stuff and double checked my vac lines and they seem good. So like Fordman, I will probably have to get a smoke test done cuz everything looks good and tight. Hope it's not my LIM gasket :/

**K Kraziee** · 06-09-2014

BTW, I smoke cigs so could I actually do my own smoke test by blowing my cig smoke through a line? Also what line would be best?

**BillBoost37** · 06-10-2014

Have you checked your 15 year old car for corroded battery cables?

**Bronco Boy** · 06-10-2014

Pretty sure I had this code after working in the car a few years back. I had the MAF unplugged during the work. After getting the code, I unplugged the MAF, re-plugged it, and the code was gone.

**paedbo** · 06-10-2014

Dont forget an exhaust leak before o2 can cause the code too.

**K Kraziee** · 06-10-2014

I think I figured it out. I'm pretty sure it was my egr tube to the intake that was bent up a little. I deleted my egr today and so far the code hasn't come back after a good 30 mile drive.