Question about Volkswagen Beetle
P0300 random misfire, p0302 cylinder 2 misfire, p0304 cylinder 4 misfire, p0411 secondary air injection system incorrect flow detected, p1296 cooling system malfunction
Posted on Apr 15, 2015
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Posted on Jan 02, 2017
These are cylinder misfire codes meaning ;
P-0300 = RANDOM OR MULTIPLE MISFIRE
P-0302 =CYLINDER #2 MISFIRE
P-0305 =CYLINDER #5 MISFIRE
Check spark plugs, wires, and coil(s)
Posted on Mar 31, 2010
OBDII those codes generally mean misfire.
P0300 multiple missfire
P0301 missfire cyl 1
P0302 missifre cyl 2
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 back to the shop.
You are misfiring on all 4 cylinders and it is not spark plugs. Those misfires if not addressed can cause serious engine and/or cat converter damage. There are lots of things that could be causing it and most of them need to be checked out at a shop - unless you want to invest several thousand dollars in the appropriate equipment and training.
Posted on Dec 21, 2010
If you get
error codes and
you have an engine that misfires or runs rough, it can be the injector for that
cylinder or the coil pack. The P0300 code is a random misfire code and may or
may not be the above. All the other messages are for misfire of a particular
cylinder indicated by the last digit.
Test the coil pack by switching it to another spark plug and
see if the problem follows to that cylinder.
If that makes no difference, it is very likely the injector.
Disconnect the injector connector of the same cylinder and measure the
resistance. It should be 13.5 to 14.2 ohms at 70 degrees temp. It can be up to
16 ohms if the engine is hot. If you see a really high resistance or an open or
short then you can try to change the injector. If not, you can remove the fuel
rail on that side and switch the injector to another cylinder and see if the
problem follows to that cylinder.
need a 22mm wrench to remove the fuel pressure regulator. The other connections
are std. When all screws are removed, GENTLY wiggle the rail up and guide it
smoothly out. Don't put any sideward stress on the injector bodies.
Here is how to identify cylinders
Front of vehicle ^
All of the
injector connectors have a Black with red stripe wire. The corresponding other
wire color on the injector connector that matches with above are
Posted on Mar 08, 2011
P0300 - Random Misfire code
P0302 - P0304 and P0307 - Misfire code on cylinder #2, #4 and #7
This description and procedure work in all cylinders failed; A P0302, P0304 and P0307 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 #2, #4 and #7.
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 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
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.
P1391 - Rough Road Sensor Performance
The engine control module (ECM) identifies engine misfire by detecting variations in crankshaft speed. Crankshaft speed variations can also occur when a vehicle is operating over a rough road. The ECM receives a rough road signal by a rough road sensor or an electronic brake control module (EBCM), if equipped with the antilock brake system (ABS). The ABS can detect if the vehicle is on the rough surface based on wheel acceleration/deceleration data supplied by each wheel speed sensor. This information is sent to the ECM by the EBCM through the rough road signal circuit. For vehicles without ABS, the ECM receives a rough road signal from a wheel speed sensor located at the front left wheel. The ECM can determine if the vehicle is on a rough road surface based on the signal from the wheel speed sensor.
Conditions for Running the DTC:
* The vehicle speed is between 5-100 km/h (3.1-62.1 mph).
* The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC:
The ECM detects that the change in rough road wheel speed sensor signal is less than 2 km/h (1.2 mph) while the change in vehicle speed is greater than 5 km/h (3.1 mph).
- Ignition OFF, disconnect the harness connector at the B171 Rough Road Sensor.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.
* If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.
- Ignition ON, test for 0.2-0.8 V between the signal circuit terminal 1 and ground.
* If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
* If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
- If all circuits test normal, replace the B171 Rough Road Sensor.
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Posted on May 04, 2012
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