Hi all,
Writing from the Nordics, we have a Mazda 2012 2.0 DiSi.
Driving along, the check-engine light came on. Couple of times the engine stumled/ "jerked", particularly if the gas was pressed. OBD2 gave an error P0301 (P0301 Cylinder 1 Misfire Detected). Other tests seem fine.
Readiness monitor tests:
ok Misfire monitoring
ok Fuel system monitoring
ok Comprehensive component monitoring
ok Catalyst monitoring
ok Oxygen sensor monitoring
ok Oxygen sensor heater monitoring
ok EGR and/or VVT system monitoring
So, I am assuming since the others were okay, this is likely the ignition coil?
I have checked from the importer, and multiple dealerships, none of them have the OEM part in stock. What are the problems with using a non-OEM product?
PS. In addition to changing the coil, I am also planning to have the compressions checked.
Any other advice?
I am assuming since the others were okay, this is likely the ignition coil?
Never assume anything. Verify the fault before buying parts. In this case you can swap the suspect coil with another cylinder and see if the problem travels with the coil.
What are the problems with using a non-OEM product?
They frequently don't work properly and/or fail quickly. For a Japanese car the coils would usually be manufactured by Denso or NTK. Possibly the old coil has a manufacturer's mark on it. If not, and it proves to be faulty, you could try one of the above brands.
@chucktobias Thanks! Appreciate the insight.
@chucktobias BTW, based on your experiences, what else could the P0301 refer to? I am thinking, maybe clogged injector? I would have said that the O2 sensor and the MAF should be okay, as other cylinders do not report anything?
PS. I am not into automative per sé, and so trying to get as much as an idea before I head off tomorrow to the shop.
It could refer to many different things. (Check out the troubleshooting section of our FAQ for details.) You cannot assume a sensor is good without testing it, but in general the ones you mention would affect the entire engine.