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Discussion Starter · #1 · (Edited)
My CEL came on recently and upon further investigation with a scanner , the code came up as p0171.

I've tried my best to figure out what the cause is , but I'm at a loss as to what the problem is .

Things I've checked/ Replaced / Cleaned:

PCV Valve - Replaced just yesterday

O2 Sensor - The one that screws into the front of the exhaust manifold was replaced no more than 1 year ago

Checked every vacuum hose that I can think of , especially the pcv hose ,which i took off to check it up close

Cleaned the Throttle body

Cleaned the MAF


My car idles low , around 680 with the occasional hiccup down to 640. My car has 180,000 miles on it . Any ideas/ suggestions would be greatly appreciated.

I almost forgot, but I checked my air box and the pcv filter is missing . I remember seeing a small piece of it there a long time ago , but back then I didn't know that's what it was.
 
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