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2001 Lexus GS300 code p0300, p0301, p0303, p0305 and CEL flashing

CEL flashing when RPM is over 3500. Replace new plug OE, new wireset OE, No luck. Please help. Thx

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  • sean Dec 05, 2012

    Note that car will not set any code (after reset the CEL) and run very smooth below 3500RPM (or around 3800RPM).

  • Anonymous Dec 05, 2012

    You have codes for misfire on 3 cylinders Don't use it Have it resolved

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2 Answers

You have an indication of a Converter Damaging Class A
Cylinder Misfire-- when a check light flashes

You got bad coils or module,whatever type ignition you have

Resolve before using it at all

Posted on Dec 04, 2012

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  • Cars & Trucks Master
  • 14,363 Answers

Here's a link to your codes and causes.

Posted on Dec 04, 2012

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Posted on Jan 02, 2017

ZJLimited
  • 17970 Answers

SOURCE: codes p0300 p0301 p0303 p0305 no driveability

P0300 - Random/Multiple Cylinder Misfire Detected
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0300 may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* Defective computer

Possible Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Try this same solutionsa for each case, keep in mind that P0302 is missfire for #2 cyl, P0305 is misfire for #5 cyl and more.

Hope this helps (remember to rate this answer).

Posted on Jan 25, 2011

  • 197 Answers

SOURCE: codes:p1346/p1349/p1354/p0446/p0300/p0301/p0303/p0305/p0307/ p0430/car runs rough

P0301 Cylinder No. 1 Misfire Detected
P0302 Cylinder No. 2 Misfire Detected
P0303 Cylinder No. 3 Misfire Detected
P0304 Cylinder No. 4 Misfire Detected
P0305 Cylinder No. 5 Misfire Detected
P0306 Cylinder No. 6 Misfire Detected
P1346 Variable Valve Timing (VVT) Circuit Range/Performance Fault
P1349 Variable Valve Timing (VVT) System Malfunction
P0330 Knock Sensor
P0446 EVAP Vent Control Fault
P0430 Catalyst System

Stop driving immediately.....

You defiantly skipped on your timing........

Posted on Feb 15, 2011

dsacco86
  • 1077 Answers

SOURCE: obd codes p0300 p0301 p0303 p0305 p0401

P0401 Exhaust Gas Recirculation Insufficient Flow Detected

P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected


I would check out the EGR valve. That maybe what is causing all the misfires.

Posted on Mar 24, 2009

  • 496 Answers

SOURCE: P0300 P0301 P0302 P0303 P0304

Have you had somebody clear the codes after you installed the parts.If not the codes have to be erased by using a scan tool.

Posted on May 05, 2012

  • 236 Answers

SOURCE: Lexus engine check code P0305

All of these codes are misfire codes.clicking sound is most likely spark jump from plug wires to metal(head,block,valve cover etc.)

Posted on Sep 10, 2012

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Codes:p1346/p1349/p1354/p0446/p0300/p0301/p0303/p0305/p0307/ p0430/car runs rough when idling/lexus gs 400 1998


P0301 Cylinder No. 1 Misfire Detected
P0302 Cylinder No. 2 Misfire Detected
P0303 Cylinder No. 3 Misfire Detected
P0304 Cylinder No. 4 Misfire Detected
P0305 Cylinder No. 5 Misfire Detected
P0306 Cylinder No. 6 Misfire Detected
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Stop driving immediately.....

You defiantly skipped on your timing........

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Code reader showes random misfire on cyl 1,3,5, have already changed the plugs


if the wrong spark plugs were used it could create a p0300 code. these cars call for ngk or nippon denso plugs. if i understand what you are telling me you have 4 related codes p0300(random missfire)p0301(cyl 1)p0303, and p0305. if this is the case then check your plugs again. if someone put in autolites to save money, throw them in the trash. they have a place, this is just not it. make sure your maintenance is up to date and the timing belt has been changed. it is recomended by hyundai at 60,000 miles.

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P0300 Random/Multiple Cylinder Misfire Detected
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P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected


I would check out the EGR valve. That maybe what is causing all the misfires.

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What do these codes mean?


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i love code questions!!! i'm so good in this!

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