Question about 1997 Cadillac Eldorado

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Engine service soon light on

I had one mech. tell me that it was that it was the oxy. sensor and another tell me it was one of the engine moduals.


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Your engine service light is coming on cz there is something not right going on in your engine. get a code reader and tell me the codes that come up

Posted on May 11, 2009

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Hi I have a 2007 Suzuki xl7 and is running when idlinidling and give me a code P0300 any idea why?


wow no engine stated in an engine post.

2.5/2.7 and my guess, 3.6 liter, 252 hp (188 kW) V6 ????

sure, that is random misfire. there vast causes,

each misfire is dejected by weak power from 1 or more cylinders.

in this case, many.



we find them by doing tests. with real tools. and meters.

in physics its just about 3. compression, spark or fueling bad.

300s means that all or most cylinders are misfiring, .



  1. never getting a tuneup is top reason now for 100 years. endless story of folks not doing service. for sure at 60k miles.


  2. bad spark. (opps see #1 )


  3. lean or too rich air /fueling ratios. flooding or bogging lean , you never stated driving issues, hows it drive?????


  4. EGR stuck open.,


  5. CEL LAMP stuck on ,driver ignoring it?


  6. Scan tool attached, and the mech fails to see lots of DTC errors, not just P0300.s ?


  7. bad oxy sensor, in such a way that cause, #3


  8. bad MAF sensor, not dead, just weak. or just needs cleaning.


  9. Any illegal air leaks to this engine will cause lean outs.


so any mech would use his scan tool and look and PIDs

live data.

is engine getting to 180F OR MORE and holds,(ECT PID)

is engine in closed loop at idle, yes/no,

if no, fix that first.

ok yes,

is LTFT near 0, or most run about -5% is it?

if LTFT is way off, or the car has over 100k miles, try 2 new oxygen sensors B1-S1 and B2, S1, to 2 top sensors, in gringo talk.

or in tech talk, both upstream sensors

my guess is its not the 02 oxy sensors. but is

A/F wrong

or bad spark

and #1 all time hit , is never ever tuned up..not in 7 long years.

Oct 19, 2014 | 2007 Suzuki XL-7

2 Answers

Poor gas mileage


Check Oxygen sensors. There are 2 of them and not very costly. should be $20-25 each. But if oxygen sensors are bad, you should have 'Chek Engine' sign on. Do you get Check Engine Sign ?

Aug 14, 2012 | 2002 Buick Century

1 Answer

O2 sensor, car miss firing, service engin soon light came on after fillingup


It would be kind-of nice to know what kind of vehicle we are talking about. It would also be nice to know WHAT ABOUT O2 sensor??? If the engine is misfiring, there are several things that can cause this. It could be anthing from a worn out spark plug, all the way to a cracked cylinder head and a whole bunch of other stuff in-between. The problem must be DIAGNOSED. The service engine soon light is trying to tell you that there is a problem and that you need to get your engine control system serviced! If the engine is misfiring, the Service Engine Soon light is SUPPOSED to be on!

Feb 04, 2012 | Cars & Trucks

1 Answer

Service engine soon light is on,my mechanic says his tester shows a #2 exhast senser is bad


would that be o2 sensor bank 2 which would be the o2 sensor after the catalytic converter the scan tool gives the code stored in trucks memory and that gives a place to start and if mech tested sensor and bad replace it

Jan 18, 2010 | 2002 Chevrolet Blazer

1 Answer

2001 CHEVROLET VENTURE VAN, service engine soon light on continuously (no problems) ABS brake light on (they do not work), AC does not work all checked out by mechanic who can't find the problem


as to abs problem have a bad sensor or sensor connection not secured to clip did mech scan for codes scanner would explain which side is setting off light ac can be any thing from no freon in line compressor wont come on to fuse/or control at dash if getting power to compressor a/c-clutch may be bad or needs more freon to engage clutch the mech should have given you the codes that set off the service eng soon

Sep 28, 2009 | 1998 Chevrolet Venture Cargo

1 Answer

Light on dash states service engine soon


replace the 02 sensor and the light will go off.

May 29, 2009 | 2000 Buick LeSabre

2 Answers

How do i re-set the service warning light on my 2003 Alero?


This depends on which light you are reffering to. There is a sercive engine soon light, and a service vehicle soon light, as well as other warnig lights.

Mar 17, 2009 | 2003 Oldsmobile Alero

1 Answer

Oxy Sensor


Makes 100% sense to me

I have a 1999 SL1 that I'm having a field day with. I installed a OEM cruise control on the car, took it to the dealer and had them program the PCM to see the cruise.

Cruise works flawlessly, but now I have a Service Engine Soon and Service Lights on all the time (Crank position sensor error and 1 cylinder missfire error) that the dealer cannot get to reset (Car runs perfectly) Dealer has worked on it 4 days so far (at their cost, not mine) they seem to be stumped. I love it!

Aug 06, 2008 | 2006 Saturn L300

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