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Here's the blog that saved me $240 in labor charges: http://toyota-solutions.blogspot.com/2011/02/got-p0171-blues-in-your-toyota-corolla.html

Drive about 1k a month or less, I generally change every 5k mile based on toyota's guidance, and each oil change is $20...so roughly 2-3 changes per year about $40-60.

how many miles are on it? did you check out the intake manifold gasket? mine was knocking a lot but after replacing it, it's back to normal

Manually replaced intake engine manifold gasket and cleared battery. No issues since replacement. Same old conventional engine oil 5W-30, no knocks, no CEL. Thanks for the offer though Scott, but I'm too poor to get synthetic although it sounds fantastic to use! Old black rubber gasket was...

P0171 system too lean on left side was pulled up from the CEL

I've been doing a little research on this, and I've yet to get the CEL code checked but I'm starting to feel it might be a leaky intake gasket manifold, with a lot of people complaining about this issue in cold weather...

Hi Scott, Thanks for the quick response. By old school petroleum oil, are you referring to the engine oil? I had an oil change at the end of September and I think the mechanic put in Chevron 5W-30. I'll check to see if the CEL comes back on before I take it back. Thanks!

Hi Everyone, I have a 2006 Corolla LE 1.8 liter. Started up today in 17 degree fahrenheit weather and drove on a cold start engine. I think I felt knocking when the car idled during stop lights, and later noticed the check engine light come on :(. After about ten minutes, temperature rose...

Hi. I have a 2006 Toyota Corolla LE. Recently was on a trip and went through some rocky pavement (freaking construction and poorly maintained noise). Had the music blasting and was at 70 MPH most of the time so didn't notice any unusual sound. When I got off the freeway, turned off the...