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P0401 "egr insufficient flow" can indicate many things, including:

1-vacuum line plugged or leaking 2-pipe from exhaust to egr valve plugged 3-pipe to vacuum modulator valve from egr valve plugged 4-passages at egr are plugged 5-bad egr valve 6-bad EGR VACUUM MODULATOR VALVE

I tried cleaning egr modulator valve, (beside/above egr)removed and tested egr vacuum & movement, inspected and cleaned all vacuum lines openings and pipes. All above did not work. I replaced the egr vacuum modulator valve. Light went out without a reset in about 30 miles of driving. Not sure if this valve can be cleaned. Retails for $69.US

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โˆ™ 2015-07-15 19:35:01
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Q: How do you replace the EGR valve in a 1996 Lexus ES300 to resolve 'insufficient flow' and 'check engine' message?
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