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P0401 Insufficient EGR Flow.
P0402 EGR Flow Excessive at Idle.
P1405 Differential Pressure Feedback Electronic Sensor circuit Upstream Hose.
First off, how can you have insufficent and excessive? kinda confused. Next, what the hell is 1405, and how do i fix that. I need to get this done asap as I need to get my car on the road again, due to my tabs being expired.
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also, how can I reset the check engine light, so I can go take it while its off, so i can pass.
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I doubt it will stay off for long.
You may just have a bad DPFE, but check and see if the upstream hose is off. If it is, you probably have clogged preCATs.
"Those who cannot remember the past are condemned to repeat it" -George Santayana
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Reset the engine light by removing your battery cables for ~10 mins, the putting them back on. You're PCM will re evaluate itself, then come back on once it knows what's going on with the engine. Mine comes back after about 25 miles of driving, other peoples comes on faster, and others takes longer.
But when I took mine to get tested, the CEL was on, and I thougth the car was running rich, but I passed with flying colors.... Did they guys just hook me up, or did I just pass on my own?
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The guys failed me, because there systems usually make it come on. And well, it was already on. Then when it failed in those three places, they said you failed for three reasons. So now i gotta get that fixed asap, as my car is parked in my parents garage at their house till further notice.
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Originally posted by PlatoSVT:
Reset the engine light by removing your battery cables for ~10 mins
There's an alternative method that takes proly no more than 1.5 min.  Just pry open the fuse box (engine bay) and pull out the fuses # 4 and # 11, wait one minute and put them fuses back in. That's how I took my CEL off, which - knock knock on the woood - never came back.
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lol, I will have to do that, much easier then waiting ten min. Will it reset my stereo settings, (i don't think it will, but i still hate when it does lol)
95 SES Sold
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Originally posted by auiotour:
P1405 Differential Pressure Feedback Electronic Sensor circuit Upstream Hose.
I still would like to know what this means if anyone could possibly tell me if they know even.
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When was the last time you did this? Start there. Check to see if your vac hoses have come off the DPFE sensor, if there was excessive backpressure that blew them off, that would explain the excessive/insufficient contradictory codes - or your EGR valve diaphram blew. If the hoses are off, you may have clogged precats.
Must be that jumbly-wumbly thing happening again.
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Originally posted by auiotour:
Will it reset my stereo settings, (i don't think it will, but i still hate when it does lol)
I don't think so; the microproccessor chip in your stereo stores the info regardless of the powering status. Again, I am not sure LOL but it makes sense. Wait, I meant the fuses disconnection, not the battery terminals; however LOL I don't get why even disconnecting the battery would interfere with your settings. If you disconnect your comp from a power source it wouldn't change its time setting, now would it?
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