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Dean, ASE Certified Technician
Category: Car
Satisfied Customers: 268
Experience:  ASE Master Auto Technician
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i had 1997 corolla codes P0401 egr insufficient flow, can you

Customer Question

i had 1997 corolla codes P0401 egr insufficient flow, can you please help me.. which parts do you recommend to change?
Submitted: 8 years ago.
Category: Car
Expert:  Dean replied 8 years ago.
You probably have clogged egr passages. This is pretty common for these cars. You can try removing the egr and spraying some cleaner down the passage and let it soak then try passing some wire down the passage (a coat hanger works ok). This may open it up. If not then you will to start removing items to where you can get the passage clean.

Hope this helps
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Customer: replied 8 years ago.
i did remove some hoses connected to the egr valve nd spray cleaner and still getting the codes, one thing i have notice is from the egr valve that connected to Q port of the egr vacuum modulator has positive flow air, does this section suppose under vacuum since its ties to the intake manifold?
Expert:  Dean replied 8 years ago.
Not at all times. The egr passages run thru your intake and that is where they usually clog up at.