the trouble code is dtcNONE everytime, i have no trouble code, but my SES light keeps coming back after a day.. can any of these cause it:

1. need to replace my steering pump
2. somewhat low engine coolant

why is my SES light keep coming on after i disc the battery, it works for a day then comes right back.

 

What year is your car and where are you getting DTCNone from? The guage cluster?

Newer than 95 requires you to drive the car until its completed a full drive cycle. That means it can take up to a week to actually retrieve a code. Some sensors need to be worked through several start-ups, shut-downs, and driving at various speeds in order to be recorded by the ECU.

 

im an 02 5 speed, i d/c the neg. terminal on my battery, then the light is off, but everytime ive done this(3x) it comes back within a day or two, and its dtcNONE on the cluster yea, the diagnostic test that reads the entire cars computer (fuel,oil,dtc, etc)

well, there might be another thing, i recently switched to 5w-30 from 5w-20 for the extra heat protection in the summer, and i read that it gives you 30% more engine life even though you lose that 1% mpg/fuel economy... could that be it?

edit: by the way when i do the instrument diagnostic, the Oil reads 000 (but there is oil)

 

you need to take it to autozone or something and have them read the code from the obd2 port. the code your getting doesnt say anything at all. its free, just run the car over there real quick. we can give you a very good idea of what the problem is if you get that code from them.

 

+1 the cluster code reader will give either dtcNone or P5284. It happens on the F-150's and Mustangs and no one has been able to explain it. Just go to Autozone and have them do a code scan. I'm guessing the dtcNONE code is when the car has no clue what its seeing. There are two types of codes, Generic that start with a P0 and Car specific that are P1. I don't think Ford has the P0 codes in the ECU so the car reads dtcNone by default.

 

ok i went to autozone, he printed me out a receipt for the problem..

P0455 - EVAP

Definition: EVAP large leak detected
Explanation: The ECM has detected a large leak in the EVAP system during a system monitor test.
Causes: 1. Defective, loose or missing fuel cap 2. EVAP canister broke, hose cracked or not connected 3. Purge or vent solenoid defective. 4. Vacuum leak at engine.

Well, my fuel cap is in, is the sensor screwed up? I did have to mess around with it when replacing the filler neck sealant

 

ttt

 

Probably not but you more than likely missed something when you worked on your car. Check your filler neck and return lines at the rear of the car to make sure you didn't forget to attach something or tighten something down. Since most of those lines are hard plastic it's possible you cracked one and didn't notice.

Also take a look in the passenger side, front, tirewell, there is an AIR pump there with plastic lines leading to it. If you remove the Air Box where the filter is at you'll be able to reach the top of it through the hole. Make sure the lines are attached. They may have come off since they just push onto the fitting.

 

I actually had the problem before, but a shop turned the light off (for 80 friggin bucks) and it just recently started coming back, will check the fender well now