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WHAT IS THE CAUSE OF THE PO301 CODE? - 2003 Mitsubishi Lancer

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The error code p0301 ,This code is related to misfire.The cylinder is misfiring. p0301 this is the indication of cylinder number 1 ,that is misfiring.If the code comes up as p0300 this is the indication of random misfire from all the cylinders.But in your case its indicating p0301 this is indication of cylinder 1 misfire.Check cylinder 1 and replace the faulty cylinder 1 to clear the fault.The spark plugs and the wires connecting to spark plugs also needs to be checked. Keep updated with any more query.Thanks.

Posted on Oct 12, 2010

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SOURCE: have po301 code 1 cylnder misfire whats the

anything from bad wire .plug or fuel delivery problem to cylinder 1pull plug and c if fouled -also test wire for break

Posted on Feb 20, 2010

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1 Answer

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P1300


Error Code: P0301
Description:
Cylinder 1 - Misfire Detected
Possible Cause:
Wiring.
Ignition system.
Fuel injectors.
Fuel pressure.
Running out of fuel.
EVAP canister purge valve.
Evaporative emission system.
Low compression.
Base engine problems.
Engine control module (ECM).

Error Code: P0302
Description:
Cylinder 2 - Misfire Detected
Possible Cause:
Wiring.
Ignition system.
Fuel injectors.
Fuel pressure.
Running out of fuel.
EVAP canister purge valve.
Evaporative emission system.
Low compression.
Base engine problems.
Engine control module (ECM).

Error Code: P1300
Description: Random Misfire

Possible Cause:
As above.

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Change both front sensors-- if you have dual exhaust

What about the PO301 ?
That is a misfire on cylinder #1

Your old O2 Sensor, that was slow to respond,
as well as a misfire, shouldn't cause a stall

You had 3 problems

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Engine miss firing installed new plugs still miss fires


You may get one bad spark plug in 50 years of driving

Does that answer your question?

You did not diagnose your problem, which
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Do you have codes PO301 thru PO306?

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Have to know the system your working on

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