Q: P0302 code & car makes puttering noises

asked by on June 08, 2016

The P0302 code is showing. The spark plugs are good - my mechanic checked them. At low speeds, in town, the car literally goes putt-putt-putt. I want to have the IAC valve changed. Do you think that's a good idea?

Hello. The P0302 diagnostic trouble code indicates that a misfire has been detected on cylinder 2. Before changing the IAC valve, it would be a good idea to address the P0302 diagnostic trouble code and have the spark plugs, spark plug wires, ignition coils, or ignition control module inspected. This may solve the problem. If you aren’t getting a diagnostic trouble code for the IAC valve, then it may not need to be replaced. The P0302 trouble code is commonly resolved by having a tune up completed on the vehicle. Keep in mind that there are times when this trouble code is caused by a faulty fuel injector, burned valves, or a dead engine cylinder. I would suggest that you have an inspection of the misfiring condition completed by a certified technician, such as one from YourMechanic.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

My front drive wheel is making noise and when I break to stop the front of the car sways downward...there is a chirping/clicking noise

Hi there. I would really need to know what kind of car this is to be able to help you with this. From what you are explaining, it sounds like you either have a loose caliper or a brake pad...

Rough idling

Hello. This could be caused by a variety of things. It could be that your spark plugs or coil packs are misfiring. This means that the coil pack is not sending the proper electricity to the spark plug. It could...

Doesn't shift park reverse

Hello there, thanks for writing in about your 2005 Mercedes CLK350. This is not an uncommon fault. The most likely cause would be the neutral safety switch, transmission linkage, transmission range switch, or low transmission fluid level. Since there are...

Related articles

P0421 OBD-II Trouble Code: Warm Up Catalyst Efficiency Below Threshold (Bank 1)
P0421 Code Definition Warm Up Catalyst Efficiency Below Threshold (Bank 1) What the P0421 code means The P0421 code means that...
P2328 OBD-II Trouble Code: Ignition Coil J Primary Control Circuit High
P2328 P2328 code definition Ignition Coil J Primary Control Circuit High What the P2328 code means P2328 is an OBD-II generic code for the Ignition Coil K Primary Control Circuit High to the Engine Control Module (ECM). This means the...
P0009 OBD-II Trouble Code: Engine Positions System Performance Bank 2
P0009 P0009 code definition The P0009 code is associated with your engine’s mechanical timing. It may also be accompanied with the codes: P0008, P0010, P0011, P0012, P0013, P0014, P0015, P0016, P0017, P0018, P0019, and many more. What the P0009...