Question about 1996 Chevrolet Cavalier

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Check engine light was on, scanned it and got a code po302, what is this? couldn't find the answer anywhere on line

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That is a miss fire on the #2 cylinder. has it been a long time sense a tune up was done ? missfires can be caused by many things but main one is bad plug wirs bad plugs , bad coils. so if it has been a long time give it a tune up , which is vital to the car running good , performance , fuel econ ect.

Posted on May 29, 2009

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The code is p0302- cylnder two misfire.

Posted on May 29, 2009

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Po302, 1999 Jeep Cherokee #2 cylinder misfire


Try checking fuel injector.
Try checking compression.
Is the engine running ok, maybe you're getting a bad code, if so you need to find out how to clear it, sorry I can't help you with that. Good luck

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OBD PO302

type that

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2004 f150 5.4l dtc po171 and po302


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What does po302 mean on a 1999 plymouth neon


Check Cylinder pressure. PO302 is a cylinder misfire code. you have 4 cylinders in your car. You need to find out whats causing the misfire, could be something simple as changing sparkplugs... could be something a bit more advanced like changing rocker/lifter arm.. It's not something that you would want to drive around with for a while, it could mess more up than it would cost to fix right now.

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P0440 and P0302 scan code - changed plugs and wires. Changed emission purge valve. All vacuum lines appear to be OK. Fuel lines are not leaking. Good spark to cyclinder two when using spark tester. ...


Cylinder 2 Misfire Detected po302 . Evaporative Emission Control System po440 The last digit on a misfire code indicates the cylinder number. A code P0302, for example, would tell you cylinder #2 is misfiring. Chances are the misfire is due to a weak ignition coil. Did you change the pcv valve? Remember to put the o-ring on the new one or this problem will happen.

Sep 24, 2011 | 1997 Buick LeSabre

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What does that mean and why does the service engine light stays on


The service engine light is on because the computer has seen a problem with the operation of the engine systems, what happens is the computer is always monitoring all systems and when theres a problem the computer stores a code explaining what system has failed, for example only there may be a code po302 cylinder 2 misfiring. this would tell you that the number 2 cylinder is misfiring, with a little testing you would then check it out to see why this is happening.the first thing you need to do is have the codes read, there are many auto part stores that will scan the computer and give you a print out of the codes, if you write back and list the codes i would be able to help you further, good day.

Mar 27, 2011 | Mercedes-Benz R350 Cars & Trucks

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Engine light came on. checked for codes, 1129 appeared. can't find the code anywhere. prior to this code, replaced O2 sensor and transmisson was rebuilt . trans was done first and then code 300 came up....



Jeep code 1129:



Possible Causes

  • RESTRICTED FUEL SUPPLY LINE
  • FUEL PUMP INLET STRAINER PLUGGED
  • FUEL PUMP MODULE
  • O2 SIGNAL CIRCUIT
  • O2 RETURN CIRCUIT
  • O2 SENSOR HEATER OPERATION
  • O2 SENSOR
  • MAP SENSOR OPERATION
  • ECT SENSOR OPERATION
  • ENGINE MECHANICAL PROBLEM
  • FUEL FILTER/PRESSURE REGULATOR (HIGH)
  • PCM

Mar 02, 2011 | Jeep Grand Cherokee Cars & Trucks

2 Answers

My check engine light is on, code po302 keeps coming up when scanned.


it's P0302 actually, not the letter "o". That will help you TREMENDOUSLY when looking for answers online.

Click on THIS LINK to a very commonly used and helpful site for all OBD-II code problems (the link is for your problem specifically). Hope that helps!

Please rate me too! Thanks.

Feb 02, 2011 | 2001 Mercury Grand Marquis

1 Answer

I have a 2000 chrysler concorde that the engine light just popped on - the error codes are po302, po420, po340


P0302-cylinder #2 misfire detected
P0420- catalyst efficiency below threshold bank 1
P0340-No cam signal at PCM.
The Cam sensor most likely needs to be replaced first. Clear the codes after that and drive and see what comes back on.

May 29, 2009 | 2000 Chrysler Concorde

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1999windstar missing prob


check the pcv valve vacum lines for a leak a vacum leak will set 171 174 codes. lift the hood with engine running and listen for a air leak , check all vacum lines if no vacum leaks can be found then clean the mass air flow sensor by spraying carb cleaner directly on it for about 5 seconds. in other words take the air filter cover up and spray down the tube that leads to engine. shine a light down hose first and see if u can see the mass air flow sensor so u can get a direct hit

Jan 13, 2009 | 1999 Ford Windstar

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