EGR Valve or what?

Question:
went to a smog shop, they diagnosed my check engine soon light.. the code was reading PO402, EGR Flow excessive. ALL OF THESE WERE OK: EGR Vacuum sys, EGR Valve, EGR temp sensor and EGR vacuum solenoid. He replaced the vacuum MODULATOR/ TRANSDUCER because this was working without backpressure (meaning that the EGR Valve was working too much)...

I have to keep replacing my windshield. The Car Talk guys say it's because they're being made thinner

After 2 days, the check engine soon light appeared again! What is the wrong? And there is anything wrong when driving!

Do you feel the difference with a 5-12hp increase in your car?

Is this electrical problem? or what? gonna go back to the same shop.

Answers:

How much does it cost to replace a cracked ball joint on a medium sized vehicle?

Here is a link that talks about ERG systems and diagnosis. http://www.asashop.org/autoinc/dec97/egr...

97 v6 firebird wont start no starter noise?

Had that problem on a ranger I worked on it was the EVP sensor.

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Body repair help?

This must b a Cali car. just a guess but sounds like a vaccum leak maybe a pinhole in one of the lines. That will change pressure

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