noluck Posted June 19, 2007 Report Share Posted June 19, 2007 I have a 1996 Deville. I have 2 error codes. P0401- EGR Flow Insufficiant and P0113- IAT Sensor Circut High Input. I replaced the EGR valve and cleared the codes but after about 40 miles the message to check emissions system came back on along with Check Engine light with codes P0401 & P0113 again. I drove the car on another short trip about 35 miles the check engine light is still on but it took a few miles for the Check emissions Message to show up. Does anyone know what I can try next? The EGR valve was expensive and I hate to buy more parts guessing. Thanks Ralph Link to comment Share on other sites More sharing options...
thu Posted June 19, 2007 Report Share Posted June 19, 2007 Do you have an FSM (Factory Servcie Manual) or access to one? If you don't, you will want to seriously consider getting one especially if you plan to keep the car for a while. http://www.helminc.com Along with the trouble code descriptions are detailed troubleshooting and repair procedures. I'm looking at those DTC codes in my FSM, but they're for a 2003 STS. Good Luck. 2003 Seville STS 43k miles with the Bose Sound, Navigation System, HID Headlamps, and MagneRide 1993 DeVille. Looks great inside and out! 298k miles! Link to comment Share on other sites More sharing options...
Ranger Posted June 20, 2007 Report Share Posted June 20, 2007 You probably replaced the EGR for nothing. All that was needed is to pull it and clean the pintle valve. Check the IAT sensor. Make sure the plug is connected and clean. It should be in the air filter housing on the '96 if I remember correctly. If it is OK, maybe the sensor has failed. Link to comment Share on other sites More sharing options...
daniel812 Posted June 20, 2007 Report Share Posted June 20, 2007 I would agree to srat with checking the sensor and connections. Also with the EGR you should clean the passages and make sure none are blocked with carbon buildup. Link to comment Share on other sites More sharing options...
noluck Posted June 20, 2007 Author Report Share Posted June 20, 2007 I am on the hunt for a FSM. Thanks Link to comment Share on other sites More sharing options...
noluck Posted June 20, 2007 Author Report Share Posted June 20, 2007 Thanks for the info Larry, I will try your tips out. Ralph Link to comment Share on other sites More sharing options...
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