If it’s just a scratch, it’s usually no problem to use a filler and then repair the wheel. Check on youtube, there are many guides on how to do this! If it’s bent or cracked you may have to replace it though.

Hmm sounds strange because these things are usually not related, could maybe cause the ECM to recheck the values. But check the EVAP lines and other vacuum hoses to ensure there are no leaks. I would also test a catalytic converter cleaner in the tank and diagnose the catalytic converter properly before replacing it

P0420 Code – Meaning, Causes, Symptoms (& How to fix)

The P0300 code means misfires on multiple cylinders, rather than a P0301 code, for example which means a misfire on cylinder 1. Usually, if you see the P0300 code you want to look for other trouble codes like lean mixture or P0301, for example. If there are no other codes, you have to start checking the basic stuff.

Due to the fact that P0300 involves multiple cylinder misfires and no other codes, it doesn’t have to be an ignition problem, it is more likely a fuel mixture problem. I would start looking for any vacuum leaks around the intake and then check the sensor data with a scanner to see if there is anything out of spec. You can also check the spark plug tips, if they are white it means the engine is running rich and you want to check the fuel supply also.

Here are some causes that can trigger the P0300 trouble code:

Damaged spark plugs
Damaged Ignition coil
Faulty injectors
Vacuum leak
Malfunctioning oxygen sensor
Burnt exhaust or intake valve
Defective catalytic converter
A defective throttle position sensor
Faulty PCM
Head gasket leak

The list is taken from this article, and you can find more about the P0300 code here: https://mechanicbase.com/trouble-code/p0300/

Is the car cranking on the starter, or does nothing happens? If this is the case you can find a lot of information about it in our article 🙂 :

https://mechanicbase.com/engine/car-engine-cranks-but-wont-start/

About the reliability, I need a little bit more information about the engine type, etc. However, Honda is often a quite simple but relatively reliable car, while you will most likely get more comfort in the Jetta. You need to consider that the Jetta is 5 years newer and a lot can happen in 5 years, even if it’s the same mileage.

To answer your question fully I would need to know what engine types you are looking at. I would suggest you to test drive both of the cars first because I can imagine that you will feel a big difference in them!

Wrong oil typically don’t create that big of an oil leak. However, too much oil could potentially make it but is not very likely to be fair! Oil leaks are quite difficult to find and to find it, you need to clean the whole engine with a pressure washer carefully, and then start the engine and check where the oil is coming from visually!

Did you install the recommended battery with the right specifications? If everything works fine, you may just need to reset the trouble codes.