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Question:

According to my ‘96 factory OBD II manual for the 5.0 V8 Explorer, DTC 402 is Exhaust Gas Recirculation (EGR) excess flow detected, or flow at idle, the self-test has detected EGR flow. Possible causes: Non-seated EGR valve Damaged EGR valve Damaged EGR Valve Postion (EGR V.P.) sensor Plugged or pinched EGR valve vaccum hose Plugged or iced EGR Vaccum Regulator (EGR V.R.) solenoid vent EVR circuit shorted to ground Damaged EGR Vaccum Regulator solenoid Damaged PCM The system test for a stuck open EGR valve or EGR flow at idle is continously performed whenever at idle (TP sensor indicating closed throttle) The monitor compares the DPFE cicuit voltage at idle to the DPFE circuit voltage stored during key on engine off to determine if EGR flow is present at idle. – Hide quoted text — Show quoted text ->What does the Code 402 stand for? >If you tried replacing the valve and sensor and it didn’t fix anything.. >try returning them. Even though they say you "can’t return electrical >parts" they still accepted mine with a little persuasion. Just make sure >that it’s perfectly clean, etc. >My guess is that if you’ve replaced the EGR valve and sensor already, it >must be the solenoid (only thing left, really). >I’m sure you’ve read the series of emails for my problems… >Try hooking a vacuum line up directly to the EGR valve while the engine >is idling.. it should run really rough or stall – if it does this is >good and means that the line from the exhaust manifold to the air intake >manifold isn’t clogged. >While the truck is running try pulling the vacuum line off of the vacuum >solenoid to see if there is a vacuum making it to there. If there is no >vacuum, then you probably have a crack in the hose between the vacuum >lines and the solenoid. If there is a vacuum, then the solenoid could >definetely be your problem. >You also may want to test if there is power making it to the solenoid >(light voltage test meter – poke it through the red wire). >What does the 402 mean? > I had a check engine light on and scanned the code and received code >402.  I > replaced EGR Valve and sensor  ( 1996 Explorer V8). Check engine light >came > back on the same day.  I scanned again and got the same code 402. >What might > caise this ?  Could it be the EGR Vaccum Solinoid ?  Could it be stuck >open, > How can I test it… HELP PLEASE ??? > Randy >Before you buy.

Response:

>> I had a check engine light on and scanned the code and received code 402.  I > replaced EGR Valve and sensor  ( 1996 Explorer V8). Check engine light came > back on the same day.  I scanned again and got the same code 402.  What might > caise this ?  Could it be the EGR Vaccum Solinoid ?  Could it be stuck open, > How can I test it… HELP PLEASE ??? >Did you replace the hoses from the sensor to the EGR tube?

Yes

Response:

What does the Code 402 stand for? If you tried replacing the valve and sensor and it didn’t fix anything.. try returning them. Even though they say you "can’t return electrical parts" they still accepted mine with a little persuasion. Just make sure that it’s perfectly clean, etc. My guess is that if you’ve replaced the EGR valve and sensor already, it must be the solenoid (only thing left, really). I’m sure you’ve read the series of emails for my problems… Try hooking a vacuum line up directly to the EGR valve while the engine is idling.. it should run really rough or stall – if it does this is good and means that the line from the exhaust manifold to the air intake manifold isn’t clogged. While the truck is running try pulling the vacuum line off of the vacuum solenoid to see if there is a vacuum making it to there. If there is no vacuum, then you probably have a crack in the hose between the vacuum lines and the solenoid. If there is a vacuum, then the solenoid could definetely be your problem. You also may want to test if there is power making it to the solenoid (light voltage test meter – poke it through the red wire). What does the 402 mean? > I had a check engine light on and scanned the code and received code 402.  I > replaced EGR Valve and sensor  ( 1996 Explorer V8). Check engine light came > back on the same day.  I scanned again and got the same code 402. What might > caise this ?  Could it be the EGR Vaccum Solinoid ?  Could it be stuck open, > How can I test it… HELP PLEASE ??? > Randy

Before you buy.

Response:

I had a check engine light on and scanned the code and received code 402.  I replaced EGR Valve and sensor  ( 1996 Explorer V8). Check engine light came back on the same day.  I scanned again and got the same code 402.  What might caise this ?  Could it be the EGR Vaccum Solinoid ?  Could it be stuck open,   How can I test it… HELP PLEASE ??? Randy

Response:

> I had a check engine light on and scanned the code and received code 402.  I > replaced EGR Valve and sensor  ( 1996 Explorer V8). Check engine light came > back on the same day.  I scanned again and got the same code 402.  What might > caise this ?  Could it be the EGR Vaccum Solinoid ?  Could it be stuck open, > How can I test it… HELP PLEASE ???

Did you replace the hoses from the sensor to the EGR tube?

Response: