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Codes: p0300, p0301,p0420- here is the problem, We already replaced all of the spark plugs and coils, ( not original parts from honda ) check engine is on still... please help

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Posted on Jan 02, 2017

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wracefans24
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SOURCE: 5 error cods on my 2002 Jetta GLS 1.8 Turbo Engine

P0420= Catalyst System Efficiency Below Threshold Bank 1
P0300=Random/Multiple Cylinder Misfire Detected
P0301=Cylinder 1 Misfire Detected
P0172=System Too Rich Bank 1
P2181=Cooling System Performance
you need to write these down,have someone clear the codes in the car,then go for short ride and recheck which if any code reappears.it's like domino's affect,one sensor can start a chain affect with the others.

Posted on Dec 10, 2009

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My car had engine codes p0300 and p0301 so I changed my spark plugs and my coil 1 now I have codes p0301 & p0304 and I don't know why any help would be greatly appreciated thanks


P0300 is random misfires. Meaning more than one cylinder was misfiring. Year make model and engine size helps. On 4 cylinders 1 and 4 fire at the same time, this would be an ignition module. On a lot of models.

Apr 01, 2016 | Cars & Trucks

1 Answer

2006 jeep liberty: rough idling, when I press on the gas the car jerks, check engine light is on, replaced the fuel injector #1, coil, and spark plugs. Took it to firestone and they said the fuel injector...


P0301 is a misfire in cylinder 1. This can be a lot of different things, but it seems you've already been throwing parts at it. I would recommend a compression test to test for a leaking gasket or a bad piston ring or valve.

Oct 22, 2013 | 1996 Jeep Grand Cherokee

1 Answer

2009 sienna setting c.e.l. light multiple missfire codes


Change...distributor cap ..spark plug wires or spark plugs

Jul 30, 2012 | 2009 Toyota Sienna

2 Answers

Boss 302 - Misfires (codes p0300, p0304, p0307, p0420 & p0430


Hi,
Did you fix the problem?
I have a 2012 GT/CS showing p0300, p0301 and also for catalyst system as well.
I´ve replaced spark plugs, checked and cleaned injectors, coils are good and now I just have no ideia what else to do.
Any idea of how to fix that thing?!

Jul 16, 2012 | 2012 Ford Mustang Boss 302 Coupe 5.0L V8...

1 Answer

06 c230 sports mercedes code p0300, p0301, p0304


I think this is a Coil problem. try replacing coil. If not, it is a MAF problem. 06 wire should still be fine now.

Feb 15, 2012 | Mercedes-Benz C230 Cars & Trucks

1 Answer

Flashing engine light


In about 80 percent of the cases I have come across, a flashing engine or "check engine" light indicates a misfire in the engine. You should be able to take it to your local auto parts store and they will plug into your vehicles computer and be able to pull diagnostic trouble codes (DTC's) for you at no cost. Mose than likely the code or codes you will get will be in the P0300's (P0300, P0301 and so forth). You didn't mention what kind of vehicle you have or the engine but in most cases the causes of a misfire are, spark plug wires, spark plugs, faulty fuel injectors or if your engine is designed with a coil on top of each spark plug a bad coil. Ford Tritan engines a famous for their faulty coil on plugs. Hope this helps.

Dec 08, 2011 | Cars & Trucks

2 Answers

When the ac is turned on the car misses at a stop. and I have got a code of P0301.


Thank you for the inquiry. Those codes generally mean misfire.

P0300 multiple missfire
P0301 missfire cyl 1
P0302 missifre cyl 2
ect.

Ensure you have the proper spark plugs. Check the coil boots/wires, look for burn marks. Anything beyond that you may have to take it to the shop for diagnostics. Make sure to bring reciepts of whats already been done to it.
I hope we've provided you useful assistance and that this information allows you to make an informed decision as to how to proceed from here. Please be sure to vote on my response.
I hope I've earned a good rating from you today.
Please post a comment if you need additional assistance so that I can help you further.
Best wishes,
TF

Jun 03, 2011 | 2002 Honda Civic

2 Answers

I failed the emission test and I also went to get an check engine light test from Auto Zone. I received the codes P0300, P0301, P0302, P0303, P0304 and the results that I received from Auto Zone was valve...


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.

Hope helps.

Apr 19, 2011 | Lexus GS 400 Cars & Trucks

1 Answer

2002 jeep liberty. Codes P0300,301, 302


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.


P0301 Code - Cylinder #1 Misfire
P0302 Code - Cylinder #2 Misfire

A P0301 or P0302 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #1 or #2

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 P0301 or P0302 may mean that one or more of the following has happened:
* Faulty spark plug or wire
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* 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.


Hope ths helps. Keep us updated and remember to rate this answer.

Jan 03, 2011 | 2002 Jeep Liberty

2 Answers

5 error cods on my 2002 Jetta GLS 1.8 Turbo Engine


P0420= Catalyst System Efficiency Below Threshold Bank 1
P0300=Random/Multiple Cylinder Misfire Detected
P0301=Cylinder 1 Misfire Detected
P0172=System Too Rich Bank 1
P2181=Cooling System Performance
you need to write these down,have someone clear the codes in the car,then go for short ride and recheck which if any code reappears.it's like domino's affect,one sensor can start a chain affect with the others.

Dec 09, 2009 | 1998 Volkswagen Jetta

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