chevy 2500 van 1999 p1404 code and check engine light comes on. Any ideas.
Most likely a bad EGR valve or carbon build-up in
the passages in the intake manifold.
How do I troubleshoot po410 problem.
Code P0410 is not an EGR problem. That code is
for the secondary air emissions system.
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EGR Valve Questions And Answers
Buick Century EGR Code
You can hear the fuel pump come on there's gas at the shrader valve where you put PSI gauge  on
the tree. Changed the gas filter. Took it got it scanned  EGR code and (CMP) Sensor code came up.

Problem on my 2001 Pontiac Grand Prix
check engine light OBD scan code p1404 was pulled.  Replaced the EGR valve, but code came
back. Any ideas much appreciated on how to fix  this problem.

Oldsmobile Aurora V8 4.0 Liter
The "service engine soon" light is on. Sometimes it turns off but only for about 5 miles and then
comes on again. I used a computer reader and I found 4 codes :P0404 P0300 P1645 and P0404.

Chevy Monte Carlo Check Engine Light

Got Code P1404 EGR on My Chevy Malibu
Replaced the valve and light went off for a few miles but came back on.

The exhaust gas recirculation (EGR) system is used to lower oxides of nitrogen (NOx) emission
levels caused by high combustion temperature. It does this by decreasing combustion temperature.

The main element of the system is the EGR valve. The EGR valve feeds small amounts of exhaust
gas back into the combustion chamber. With the fuel/air mixture thus diluted, combustion
temperatures are reduced.
What does i have to do to fix my check engine light codes for p0174, p0171 and p0139 on my
suzuki verona?
Check for vacuum leaks and the operation of the
EGR valve.