Skip the auto shop - Our mechanics make house calls

Q: I got 2 codes P0304 and p0102

asked by on

I changed my spark plugs cleaned maf sensor with cleaner. The Fuel Pressure regulator is still good. I check spark plug wires there ok. It rides cleaner but i feel like the is still a low and high accelerating I tried to look for any leaked hoses or vacuum hoses. Do you have any other ideas that could cause does codes and the hesistating on rpm.

My car has 218067 miles.
My car has an automatic transmission.

A: Hi there: The OBD-II trouble code P-0304 i...

Hi there:

The OBD-II trouble code P-0304 indicates that cylinder four is misfiring or having ignition issues. The most common causes include a faulty spark plug, clogged fuel injectors, or even an intake valve leak. To know for certain, you might want to have a professional mechanic complete an engine is running rough inspection so they can pinpoint the source of this issue you’re experiencing.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Why won't it start with a low battery and a good jump start connection?

Hi, thanks for writing in. Your battery may not have had enough cold cranking amps (CCA). The volts may be correct but if it doesn't have enough CCA, it will not start for you. Batteries that specify cold cranking...

Q: My 2004 suburban has D 3 2 1 what should I drive in D or 3

The computer controlled automatic transmissions in today's vehicles are designed to be completely intuitive. You will not gain any performance advantage, or gain in fuel economy, by driving around town with the shifter in the 3 setting. For the best...

Q: Replaced rt.& Left Rotors and brake pads. Also Rt. hub. the problem is ABS & brake light still come on. Does this have be reset ? 2004 Buick Ranier

Hello - the short answer is "Yes", the ABS problem code needs to be cleared with an appropriate Scan/Reset tool. This also begs the question "Was the ABS specific code read when the ABS light first came on, so that...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.