Question about 1993 Jeep Grand Cherokee

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Check engine light with a p 303 code - 1993 Jeep Grand Cherokee

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  • fireddancer Aug 24, 2008

    My check engine light came on today. What does it mean I do not have the manual. Please help!



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Initially what is needed is to determine the "code of failure", then know that it and afterwards make l intervention...

Extracting Fault Codes
(sample for an 1991 year; the procedure is the same for other years).

On Board Diagnotic Code Database
(select your type ODB by year's car)

Good luck!!!

Posted on Aug 26, 2008


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Posted on Jan 02, 2017

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SOURCE: Check engine light illuminated, error

was the code P0303 ?
if so it indicates- Cylinder 3 Misfire Detected

Posted on Aug 20, 2008

  • 101 Answers

SOURCE: The check engine light has come on in a 2003 jeep

a p0303 is a cylinder number 3 misfire, which means that the computer is reading that the number three cylinder of the engine isn't contributing as much power as the others. usually is just a tune-up issue, i would suggest checking or replacing tune-up components. that will usually handle it.

Posted on Dec 10, 2009

  • 8836 Answers

SOURCE: engine idles roughly- seems to

check spark plug and ignition wire on #3 cylinder (count from front of engine. If plug and wire good, do compression test.

Posted on Sep 03, 2010

  • 2272 Answers

SOURCE: My C230 Mercedes has check engine light on. Car

P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.

Posted on Oct 01, 2010

  • 2317 Answers

SOURCE: check engine light came on and reades code 303 at

That code means that there is a misfire on cylinder 3. Could be low compression or lack of spark.

Posted on Oct 19, 2010

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Did it blow the spark plug out of cylinder 3 ?
Code 303 is for a loss of power from cylinder 3, code 1131 is for a problem with the O2 sensor in bank one and code 1151 is for the same problem in bank two. Codes 1131 and 1151 could be caused by the problem source for code 303.

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2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
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I have a 2007 Chrysler Sebring with a 2.4 engine. The check engine light came on and the car runs rough. Had the code checked and it came back with a 303, 302 and 300 codes. What is the most common...

Hello Frybird.

The codes you have are engine misfires.
Code 300 is random misfire (could be any cylinder).
Code 302 is cylinder #2 misfire and 303 cylinder 3 misfire.

Most common causes are ignition issues.
Spark plugs, ignition wires/boots and ignition coils.

Next would be fuel issues such as fuel injectors.
Next would be emission components such as EGR valves.
Then in a worst case condition would be engine wear parts (valves, camshafts etc.)

The place to begin is ignition as this is a common failure on most cars.

If you need further assistance regarding your question please ask me here in a comment.
Thank you for using FixYa.


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