Acronym for the Exhaust Gas Recirculation valve. It is a smog device which diverts spent exhaust gases back into the intake tract to help limit temperatures in the combustion chamber. The main purpose was to help reduce NOx emissions.

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Does it make the most sense to replace an old car's entire exhaust system all at once?

Back story: The Check Engine light came on in my 2005 Chevrolet Malibu LS Sedan (V6 3.5L). I took the car to a mechanic #1 (M1), an independent shop. They replaced the EGR valve. A day later, the ...
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BMW E90 M47TU2 EGR clean

I have a BMW E90 2007 with a M47TU2 engine, Can anyone tell me where the EGR valve is, how to get it off and how to clean it (with what?) Thanks
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Ford Escape 2002 idling rough in cold weather

Last week my 2002 Ford Escape started idling rough when the temperature was in the 30-40°F (-1°C to 4°C) range. It also seemed to have trouble shifting or something at 40-45 mph. I'd describe it as a ...
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Mazda 3 1.6 OBDII P0403 resolved after changing spark plugs?

I had been plagued by intermittent OBDII P0403 check engine light for months. I changed the EGR valve, had the harness replaced but to no avail. The workshop said it is the PCM and quoted a hefty ...
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What effect will removing my EGR have?

My 2003 Jetta TDI check engine light recently came on, and a scan by Advance Auto revealed code P0401 -- EGR insufficient flow. I took the vehicle to the local TDI guru, who gave me the option of ...
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BMW 33D 2001 no power problem

I have: BMW 330D, 2001 year, saloon, 135kw Recently I have change the turbo charger of my car. There was a problem related with this post. Then I went to the garage and they ran the diagnostics. ...
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Remove dark layer of particles stuck in Diesel engine tubes?

My BMW E36 M41 engine seems to have a dark dust in the small tube that goes out from the EGR valve. (the other tube contains a sort of dark liquid...) Is it advised to cleanup that dark matter ...