Question about 1997 Cadillac DeVille

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Check engine light was on. Connected scan tool, got data below and cleared faults. drove car 5 miles, check engine stayed off. p0300 random multiple misfire detected p0325 knock sensor 1 circuit bank 1 p0300 p0325 all sensors normal except below catalyst mon INC oxygen sens mon INC oxygen sens htr inc egr system mon inc

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Hook it up to a tech II-it displays a data stream to target problem--cause rite now u cud replace parts and probly get nowhere--hav u done ur regular tuneup and fuel area cleanin

Posted on Mar 25, 2011

  • 33tango Mar 25, 2011

    Haven't done anything, planning on selling car and want to give the buyer a honest deal. Only 40K on the car, one owner. Thanks for your answer.

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If the check engine light stayed off then that means that those errors are not present at this time. It is not un common to have intermittent faults but I would not preced any further until the light comes back on. Then re-scan the code see which are to begin diagnostics.

Posted on Mar 25, 2011

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Posted on Jan 02, 2017

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GMC Sierra Code P0300 Check engine light


GMC Sierra with the code P0300 Q: I have the 2003 GMC Sierra with the code P0300. What could be the problem? A: The code P0300 means "Random Cylinder Misfire". This means that the engine computer has detected that one or more of the cylinders misfire randomly. This code could take some time to diagnose, as there could be a wide range of reasons for the engine cylinders to misfire. Here are just a few examples: bad spark plugs, ignition wires, distributor cap/rotor, bad fuel injectors, bad airflow sensor, broken or weak valve spring, leaking valve, low fuel pressure, manifold gasket leak, clogged catalytic converter, etc. Take your truck to a knowledgeable mechanic and have it check out - driving with the misfiring engine can damage your catalytic converter.
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Changed 02 sensor and all codes are clear but check engine light is still on in my 99 acura cl


press the clear DTC button on the scan tool.
bam, gone.
or you are using a cheap scan tools that does not
all factory codes, and one is set.!
keep in mind, the CEL dont glow for all DTCs
and many scan tools are blind to some or all factory codes
P1xxx and P2xxx are both factory only codes, only
Acura codes,
rule 3> if the scan tool does show say P1xxx code
do not use non Acura data on that code, as its a Acura only code
only P0xxx codes are a standard here, in USA>

in some countries, even P0300 code (gross misfire) in Canada
do NOt glow the CEL, but does store the code
amazing huh?

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1 Answer

Engine Service Soon Light On code P0154


Error Code: P0154
Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected
Problem areas:
- Wiring.
- Open circuit in signal wire, between Heated Oxygen sensor 1, Bank 2 and ECM. (Must check and confirm)
- Heated oxygen sensor (HO2S).
- Engine control module (ECM).

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I would want to know what the fuel pressure is on the rail. Sounds like the fuel pressure regulator has failed, or the return line to the tank is blocked.

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gm has a problem with this from way back. double check your spark plugs and if they are not ac delcos, change them. ive seen this time and time again swearing, myself, that there is no way that the plugs would cause this issue. it always comes up with random misfire and usually another 1 or 2 codes misfire codes. put in ac delco, no more codes. let me know

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The scan tool that they used at autozone should be able to erase them and tell you whether they are existing codes or just stored. Hope this helps.

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3 Answers

Check engine light


Even with low miles, the truck has some years on it. Is the gas old? If the truck seemed to run fine, I would clear the code and see if it came back. Sometimes these things are just a one-off occurrence. If it continues, I would make sure it isn't running on old gas (if the truck has been sitting a while), then check the spark plugs, and go with the usual tune-up items.

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The check engine is a fault indicator, it will stay on until the fault is fixed and a certain number of miles driven to check that the fix was successful, it can' t be reset, you can erase the code with either a OBD 2 scan tool, or in some cases by disconnecting the battery for 1 hour, but if the fault is not fixed the light will come back on in short order. Very seldom do you fell anything different unless the fault is transmission related.

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