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Buick Century EGR Code
You can hear the fuel pump come on there's gas at the schrader 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 again
Chevy Monte Carlo Check Engine Light
I WOULD LIKE TO KNOW WHAT Exactly DOES CODES
P0128 P0440  P1440 MEANS.
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.
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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.

If a problem with the EGR system will not allow the PCM to control pintle position properly, DTC P0404 should set. The PCM
also tests for EGR flow. If incorrect flow is detected, DTC P0401 should set. See
DTC list for other EGR codes.
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EGR Valve Code Questions

Comments
10-30-11
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.
2-10-12
How do I troubleshoot po410 problem.
Code P0410 is not an EGR problem. That code is
for the secondary air emissions system.