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P0404 EGR Code


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Has anyone had any success getting this code to go away by cleaning the EGR valve? I have read that it has gone away for a while and come back, but before I bothered to clean the valve I thought I would check to see it someone actually had to code stay gone. Thanks!

Charles

Charles

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Has anyone had any success getting this code to go away by cleaning the EGR valve? I have read that it has gone away for a while and come back, but before I bothered to clean the valve I thought I would check to see it someone actually had to code stay gone. Thanks!

Charles

Yep, it comes on every 20,000 miles or so. Just clean it and forget about it. 3 10mm Bolts (2 bolts, 1 nut) and it takes all of 20 mins.

DO NOT CLEAN THE SHAFT WITH THE VALVE UPSIDE-DOWN !!!!

Use an old toothbrush and clean it without letting liquid get into the EGR Valve.

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Aaarrggghhh! While putting the EGR valve back on the car, I dropped one of the bolts and it fell in an area that I can't see. Tried feeling around with a magnetic pickup, but no luck. I went to the store and bought a regular bolt and washer. The local Caddy dealer doesn't have one, and if he did the stupid thing was over $7.00!!! Hope it falls out when I back out of the garage. Good thing the 99 model didn't use the top half to hold a bracket like my 96 did, even though it was the same double sided bolt.

Charles

Charles

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It is amazing how those little buggers can do a disappearing act. I once dropped a distributor hold down nut down the distrubutor hole. After fishing for a hour or two, I heard it hit the oil pan (inside). That is where it stayed.

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On a positive note, on my way in to work this morning (complete with mandatory WOT blast onto the freeway), there was no appearance of the SES light. The EGR valve was caked up pretty good with carbon, so it should be good for a while.

Charles

Charles

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Nice Charles glad you fixed it. I dropped one of the nuts for the water pump belt cover, very annoying when they disappear. Good Job, Mike

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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