Question about 1998 Cadillac DeVille

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Check engine light on

Check engin light on. Gas milige terrible .

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Get code/s from ecm, is it also missing cold hot?

Posted on Jan 03, 2014

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Posted on Jan 02, 2017

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Why is the check engine light on in my 1999 dodge stratus but is showing no codes


ECM is shorted internally. I've seen it in many makes and models. In different years. If the car runs fine and isn't getting terrible gas mileage. Leave it alone. Just check for codes every couple months, or if the gas consumption goes up. If the light bothers you, do like most, put a piece of tape over it. To fix the problem, you have to replace the ECM and have it programmed.

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Reason for terrible gas mileage.


Check coolant temp sensor. Is tailpipe black?

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1988 chevy S-10 Stalls out, has a late and hesitant responce when give gas runs terrible


Any check engine light? If check engine is on, you could diagnose by fault code. If not, I would try throttle position sensor.

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I bought a 2007 A4 Audi Cabriolet Quattro convertable a few months ago. I am very disturbed at the fact of the terrible vibration it has when stopping or idling. We have had it to the dealers twice and...


Is your check engine light on? Some of these cars will show a picture of a triangle and not the check engine light, If so, Check the codes Also try new spark plugs warm the engine before replacing the plugs they come out easy that way.

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Does the fuel filter affect gas mileage


there are lots of things that can affect gas mileage. if the spark plugs and wires are worn out, the air filter being dirty, dirty fuel filter, proper inflation of the tires, O2 sensors that are contaminated and performing poorly. the first thing to do would be that the engine is in good working order, as in no check engine light, no misfire, etc. a poorly running engine will put out terrible gas mileage. then you can start with the things i listed.

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2003 Accord TCS light and CHECK ENGINE lights comes once awhile


go to an auto parts store and have them test it.the check engine light could be a gas cap leaking. you could replace cap or o-ring,
could be a plug also.
how does the engine run. i cracked the porcelin on a plug once.
it ran terrible and the check engine light came on. i knew what it was because it didn't seem right when i put it in.
start out at the auto parts store first

Jan 14, 2010 | 1998 Cadillac DeVille

2 Answers

I have a Honda Accord 2003, how can i fix a downstraem Oxygen sensor.. does this affect the gas cosumtion performance.. how can i fix this.. Help.!


o2 sensor is very important part to the engine when it come to the fuel economy. o2 sensor send information to the computer (ECU) which compute and calculate ratio of burnt exhaust gases. if the engine is not run properly either is too lean or too rich the o2 sensor will detect it as the car will triger the check engine light. you can drive the vehicle which will not hurt it as long you can tolerated the light however the car will get terrible gas mileage and poor performance as the ECU will try to lean the engine out itself. o2 sensor is fairly cheap to replace and fix. Let assume the car get 30 mpg on the high way, running with check engine light/bad o2 sensor will change the gas mileage to 18-25 mpg. If the car is V6 make sure you replace o2 on both side. good luck!

Nov 23, 2009 | 2003 Honda Accord

2 Answers

Check engine light came on. Code P1456.


Did you change the gas cap with a Honda gas cap? Tighten it at least three clicks?
Also, Honda recommends that you never top off the tank when getting gas (only go to the click-off of the pump; otherwise you can get back flow into the system that will cause the code).
Tightening or replacing the cap will not immediately cause the light to go off; it can take up to three days of driving for the light to reset.
To check if your readiness codes (emission system) are set, turn the ignition to ON (II), without starting the engine. The Malfunction Indicator Lamp will come on for 20 seconds. If it then goes off, the readiness codes are set. If it blinks 5 times, the readiness codes are not set.
You can, of course, try resetting your engine light to see if it will come back on (which it probably will). I believe the procedure is:
Turn off the engine.
Press and hold the Select/Reset knob (odometer) in the instrument panel, then turn the ignition switch to ON (II).
Hold the knob for approximately ten seconds until the indicator resets.

Hope this helps you.

Nov 17, 2009 | 2004 Honda Pilot

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Truck has no power and very bad gas milage


have a 1997 f-150 i replaced the fule pump and injectors the truck is missing bad and geting bad milige and the fule presser wont go above 30

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Check engine light - 240 enfgine running rich


It could be a number of things but must be diagnosed via computer code check. If you are unable to do so yourself, find a reputable Volvo mechanic. It could be the air mass meter, a bad O2 sensor or something related. Mine turned out not to be the air meter but a bad ground wire going to it. Didn't find out until $400.00 later.

Jan 03, 2009 | 1992 Volvo 240

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