Code 404 is for a problem with the EGR valve and code 307 is for a miss on cylinder 7.
The egr valve would need to be tested, and the spark plug and injector checked out on cylinder 7.
SOURCE: can i reset my ac code? 1999 cadillac eldorado
Hi, follow this step for clear the a/c codes on your cadillac el dorado 1999.
I Hope you will solve your problem with this instruction page, thanks for using fixya.
SOURCE: location starter on 1998 cadillac eldorado northstar engine
well some people like where it is and some don't! i do on my 1997!, i assume u have a 4.6 engine? if u do the starter is under the intake manifold,on a 4.9 engine it is under the car on the left side facing the car, these can be a paine.,go to your local auto supply store and pick up a auto repair manual for your car,by Haynes,good book to own. the 4.6 starter is not that bad to tackle,hope we helped and good luck to u.
SOURCE: 1998 Cadillac STS with IPM U1255 code history.
U1255 - Class 2 Communication Malfunction (Serial Data Line Malfunction)
here is a link to all of the codes for your caddy
http://myweb.accessus.net/~090/dtcobd2n.html#net
SOURCE: digital dash reads out low coolant and runs hot.
it means just what it says..your low on engine coolant and that is causing it to run extra hot...this is not good! let car cooldown and take radiator cap off have a look inside with a flashlite..water level should be almost up to the filler neck. if you have the red dex-cool you"ll have to put in the same its not recomended to mix the green and red. if it doesnt your in luck just fill up a jug or get a garden hose and fill it up to the top if its low. leave cap off for now and put some water in the coolant tank if its empty only about halfway dont overfill. now start the engine and let it warm up for about a minute and see if the water level goes down if it does add a little more water up to the neck, now turn off the engine and let it stay like that for another minute to make sure trapped air can get out. Now put back on the cap. Now go for a 10 min drive around town and then see if the warnings have cleared and its running at a normal temp range. also park in a new locating so after you turn your car off you can check to see if its go a slow leak overnight.
SOURCE: how to read codes for 2001 Eldorado Cadillac
Take a look at your air con controls on the centre console.
You will see an "OFF" button and to the right of this you will see a toggle switch with an up arrow with the word "PASS" just below it.
Simultaneously press the "OFF" button and the up arrow together for three seconds or so and release when you see the instrument cluster lights come on.
You are now in diagnostic mode.
Read the codes from the digital display on the instrument cluster.
Have a pen and note pad ready to write down the codes.
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