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P0300 failed at inspection

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P0300 code is a random multi misfire in the engine.

Could be a coil pack or an injector, or down to poor service maintenance...

Posted on May 06, 2014

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I have a 1998 Nissan Maxima GLE, I Failed the Emission Inspection (DTC) Diagnostic Trouble Codes of "P1492","P1105" What these Codes exactly? mean


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 compute
  • P1105MAP/BARO Pressure Switch Solenoid Valve
  • Check and clean the MAP sensor, or replace.
  • P1492EVAP Canister Purge Control/Solenoid Valve (Circuit)
  • Replacing the purge solenoid will clear code P1492 This should also clear code P0300 as well.

Oct 16, 2012 | 1998 Nissan Maxima

2 Answers

2003 pontiac grand am error code p0300 and p0340 they said it dont have a cam position sensor


DTC 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

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


DTC P0340 - Camshaft Position Sensor Circuit Malfunction
This fault code indicates that a problem was detected in the camshaft position sensor circuit. Since it says circuit, that means the problem could lie in any part of the circuit - the sensor itself, the wiring, or the PCM. Don't just replace the CPS (camshaft position sensor) and think that will definitely fix it.

Symptoms can include:
Hard starting or no start
Rough running / misfiring
Loss of engine power

A code P0340 could mean one or more of the following has happened:
a wire or connector in the circuit could be grounded/shorted/broken
the camshaft position sensor may have failed
the PCM may have failed
there exists an open circuit
the crankshaft position sensor may have failed


If need additional details, feel free to contact us in the fault code links. Hope this helps.

Also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

Nov 17, 2011 | 2003 Pontiac Grand Am

1 Answer

I was told I failed the NY inspection test due to error codes po172 and po300. What do these indicate is wrong and where the problem may be??


p0300 is code for miltible misfires. The p0172 is code for a rich reading from engine bank #1, this code may be set by the misfireing causing raw fuel to exit that bank to the sensor in the exhaust system. The most common cause is spark related, spark plugs, wires, dist. cap. etc. A less common cause is with the fuel injection system.

Jun 24, 2011 | 1996 GMC Yukon

1 Answer

Oo dodge durango is flashing codes p0201,p0207,p0300,p0301,p0307 what is this telling me that needs to be fixed


P0201?? Injector #1 Ctrl Circ /
P0207 Injector #7 Ctrl Circ /

P0300?? Multiple Cylinder Misfire
P0301?? Cylinder #1 Misfire
P0307?? Cylinder #7 Misfire
are the codes start with the basics inspect plugs wires cap rotor and if all checks out do a compression test

Dec 31, 2010 | 2000 Dodge Durango

1 Answer

Misfire in 97 voyager,P0300 and P0304,HELP! Need 2 get inspection


I'd have fuel pressure checked, and at the very least, replace fuel filter. Not unusual to get multiple misfire codes due to low fuel pressure, thus starving cylinder(s), and causing the misfire code(s).

Apr 23, 2010 | 1997 Plymouth Grand Voyager

1 Answer

My 1999 saab 95 has been dying while driving the past 2 days. i can pull the P1300, P1549, P0300 codes with a obdii reader. where do i start with fixing this problem


p1300 and p0300 Inspect the wiring, DI cassette, and the spark plugs are clean and making good contact. p1549 Check the charge air system and the air flow through the Turbo boost pressure control valve. These are relative the code you received.

Jul 09, 2009 | Saab 9 5 Cars & Trucks

2 Answers

I have a 2001 gmc sonoma with obd error codes p0410 p0300 p0100


P0410 Secondary Air System PerformancePossible Causes Setting Conditions AIR solenoid Ignition circuit is open (check the U/H IGN fuse) AIR pump has failed (inspect air pump for water) AIR system check valves and/or pipes are damaged or leaking AIR system hoses or lines are damaged, pinched or kinked Base engine problem (e.g., excessive exhaust back pressure) PCM has failed P0300 Multiple Cylinder Misfire DetectedPossible Causes Setting Conditions Base engine mechanical fault that affects one or more cylinders EVAP system problem or the EVAP canister is fuel saturated EGR valve is stuck open or PCV system has a vacuum leak Fuel delivery component fault that affects two or more cylinders Ignition system fault (a coil) that affects more than one cylinder

Jun 08, 2009 | 2001 GMC Sonoma Extended Cab

2 Answers

Codes P0440 and P0300


Hi,

A quick Internet search on those codes pulled up the following info.
http://www.obd-codes.com/p0440
  • Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
  • Inspect the EVAP system for cuts/holes in tubes/hoses
  • Inspect for damaged or disconnected hoses around the Evap purge solenoid
  • Check and/or replace the sensor
  • Check and/or replace the purge valve
  • Have a professional use a smoke machine to detect leaks
http://www.obd-codes.com/p0300
  • 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

Dec 12, 2008 | 1999 Chevrolet Cavalier

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