code P0402 excessive exhaust flow?
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code P0402 excessive exhaust flow?
The mechanic said the problem was the DPFE but the 96 v8 does not have one so I replaced the egr and the sensor that bolts to it and the check engine light came back on. I borrowed a scanner and the code is P0402 exhaust gas recirculation flow excessive detected, then it has four ovals that are flashing which are cat, o2s, htr, eva and up in the corner it says pending code 02.
So any gueses what else or how to check.
So any gueses what else or how to check.
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The Hayse repair manual says that 95 v6 and 96 v8 explorers do not have the dpfe, and I didn't see any retangle boxes with tubes coming out of it. A couple others on this forum also said the 96 v8 doesn't have one either. The code reader I believe did mention something about bank 1, so maybe it is the o2 sensor? Will need to put the reader back on and look at it agian.
#6
Check the EVR solenoid to see if it is passing vacuum to the EGR valve when it shouldn't (at idle, for example). If it is, replace it.
The 95 and 96 5.0L in the Exploder uses an EGR valve mounted EVP sensor, not a DPFE sensor.
Uncommanded (excessive) EGR flow can cause other ODBII faults, notably those relating to mixure control (ie, O2 sensors).
Fix the EGR problem, then reset and retest before going on a wild goose chase.
Those flashing ovals on your code reader simply mean that the I/M Readiness Monitors for those functions have not successfully executed. Disregard them at this point, they're only critical if you're trying to pass a mandated emissions test that relies on OBDII system status.
Steve
The 95 and 96 5.0L in the Exploder uses an EGR valve mounted EVP sensor, not a DPFE sensor.
Uncommanded (excessive) EGR flow can cause other ODBII faults, notably those relating to mixure control (ie, O2 sensors).
Fix the EGR problem, then reset and retest before going on a wild goose chase.
Those flashing ovals on your code reader simply mean that the I/M Readiness Monitors for those functions have not successfully executed. Disregard them at this point, they're only critical if you're trying to pass a mandated emissions test that relies on OBDII system status.
Steve
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Thanks projectsho98, I actually replaced that hose at the same time but will pull it off to check for vacuum. I assume I could just stick my finger over the end to check it. I am still a little confused, should it have a vacuum at higher engine speeds and not at idle or are there other rpms it should not have a vacuum?
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I checked it this evening by pulling the little black hose off the egr housing and sticking my finger over it. At idle it did feel like fast pulsating vacuum, which it sounds like there should be none. From what you have described it sounds like the EVR is very likely the culprit, unless there is a problem with the computer .
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SinisterSS
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01-28-2004 04:12 PM