Codes finally read....P0402
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Posting Guru
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Codes finally read....P0402
From what I read in the book that came with the scanner , code P0402 is:
Exhaust gas recirculation flow excessive detected
Now, where to begin.
I haven't dug into it yet so EGR valve? EGR solenoid? Sensor of some kind?
I am going to pick up a manual tonight and start digging.
Exhaust gas recirculation flow excessive detected
Now, where to begin.
I haven't dug into it yet so EGR valve? EGR solenoid? Sensor of some kind?
I am going to pick up a manual tonight and start digging.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
Either the sensor itself, (DPFE?) or the EGR valve is leaking.
I'd suspect the DPFE (Differential Pressure blah blah blah)...
It's a known issue with the other modulars. Well, not "known issue" but definitely known to cause a problem
I'd suspect the DPFE (Differential Pressure blah blah blah)...
It's a known issue with the other modulars. Well, not "known issue" but definitely known to cause a problem
Lead Driver
Joined: Sep 2003
Posts: 5,844
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From: Albuquerque
P0402
Hope this helps...
biz
P0402 OBD-II Trouble Code
Technical Description:
Exhaust Gas Recirculation Flow (EGR) Excessive Detected
What does that mean?
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor (DPF). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0402 code means that OBD detected an excessive amount of EGR.
Symptoms:
You may notice drivability problems such as the engine may surge off idle. There may also be other symptoms.
Causes:
A code P0402 most likely means one or more of the following has happened:
*The DPFE (differential pressure) sensor is faulty and needs to be replaced
*There is a blockage in the EGR (most likely carbon buildup)
*The EGR valve is faulty
*The EGR valve may not be opening due to a lack of vaccuum
Possible Solutions:
With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor.
*Check the voltage at the DPFE sensor both at idle and when the EGR is open
*Replace the DPFE sensor
Technical Description:
Exhaust Gas Recirculation Flow (EGR) Excessive Detected
What does that mean?
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor (DPF). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0402 code means that OBD detected an excessive amount of EGR.
Symptoms:
You may notice drivability problems such as the engine may surge off idle. There may also be other symptoms.
Causes:
A code P0402 most likely means one or more of the following has happened:
*The DPFE (differential pressure) sensor is faulty and needs to be replaced
*There is a blockage in the EGR (most likely carbon buildup)
*The EGR valve is faulty
*The EGR valve may not be opening due to a lack of vaccuum
Possible Solutions:
With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor.
*Check the voltage at the DPFE sensor both at idle and when the EGR is open
*Replace the DPFE sensor
biz
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Thanks for the tips.
I will measure voltage at the sensor and go from there.
Then I will have to R&R the exhaust manifolds for those broken studs.
Then I need to install a new set of camber bushings.
Got some work ahead of me!
I will measure voltage at the sensor and go from there.
Then I will have to R&R the exhaust manifolds for those broken studs.
Then I need to install a new set of camber bushings.
Got some work ahead of me!
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