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Code po300 refers to random/multiple cylinder/s--misfire/s detected.===causes-- spark plug/s--HT leads /s--injector /s--ignition coil/s--low compression ---wiring
Check that the HT leads are not touching each other causing spark cross over . Ensure that the coil wires are properly connected . From what you have done, I would revisit everything ( all connections ) to ensure that everything is in order including firing order of the leads
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118, replace the coolant sensor. 440 is a small leak for EVAP. Could be as simple as replace the gas cap. 101 could be the MAF sensor or wiring to it. 300 is random misfire, needs to be on a scanner, Could be related to MAF sensor. 4401 is not a valid engine code.
Your codes indicate misfires. What was done in the "tune up"? Misfires can be caused by any of several different causes including (but not limited to):
spark plugs
spark plug wires
coil packs
injectors
injector wires
The term "tune up" used to mean, "replace points, condenser, distributor cap and rotor, and plugs". Since most cars no longer have points, condenser, distributor cap and rotor, we need to ask what was done...
If it was just cylinder 2 or 3, the code would be 0302 or 0303. Instead, you have random misfires (probably) such that you should be checking things that affect the whole engine. Vacuum leaks, bad plug wires, bad coil(s) or ignition module are most likely, but even clogged exhaust, O2 sensors and bad battery can cause these problems. Yes, a battery can be good enough to start your car but still be bad enough to affect performance. If I had to guess, I would start by testing the ignition module. Most parts stores can test this if you remove it and carry it to them.
p0300 is a random misfire, which usually indicates almost anything-generally a good tune up will fix it, like new wires, plugs, clean the throttle body, dist cap/rotor, check charging system, check fuel pressure, replace fuel filter...it is random (usually fuel) but a good going-over by a decent and honest mechanic will fix it.
Good Evening, I am sure you know the 0300 is a random cylinder misfire and the 0305 is a cylinder 5 misfire. One would not think that you should have to do another tuneup since you did one in june. I would say the parts are under warranty and if you feel that is what is wrong you should be able to replace them. However you could have a vacuum leak, or injector going bad. First I would pull that plug and check compression on that cylinder to start with. Also check out the plug while it is out. And go from there. Cheapest route is of course the re-tune which warrantied parts cost nothing but time. Let me know how it goes.
P0300 indicates that there is multiple miss fire in the ignition system. P0303 and p0304 indicates the miss fire is in cylinder #3 and #4.
Replace the spark plug, and wire set, and rotor and cap if there is one. Can not remember if there are coil packs on the civic, the age thing. change the fuel filter and clean out the fuel injectors with fuel injector cleaner for the next 3 full ups.
When the spark plugs are removed, inspect them for condition, if there clean or dirty with carbon build up. which would indicate how the engine is running. Keep me posted and drive safe.
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