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Re: '97 Camry - Check Engine code P0401 - Insufficient EGR Flow
Answering Mr. ajasras. My 40 years of experience is any sudden new problem that shows up after I worked on my car is usually caused by something I did. I call it Lee's first law of mechanics.
Contact the mechanic that did your extended special oil change and ask him to look at the EGR tubing connections for a pulled, pinched or swapped hose.
Since your Camry is 17 years old, a previous mechanic many years ago may have replaced the original metric dimension Toyota hose with an inch dimension hose that doesn't fit quite as tight. The EGR system vacuum switching valve VSV is behind the engine and way down. It is very hard to see and I found it hard to reach.
So, check for something pulled loose. Cheap and easy fix we hope huh?
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