Q: code po300

asked by on

I have changed the control modual crank sensor plugs wires coil pack now im lost cant get the light off checked fuel injectors with a multimeter there all reading 15.4

My car has 154 miles.
My car has an automatic transmission.

Diagnostic Trouble Code P0300 can set due to spark plugs that are damaged or worn; spark plug wires and/or coils that are damaged or worn; fuel injectors that are defective; EGR valves or tubes that are clogged; ignition timing that is off; vacuum leaks; fuel pressure that is low; head gasket(s) that are leaking; camshaft sensor that is faulty; crankshaft sensor that is faulty; mass air flow sensor that is faulty; oxygen sensor that is faulty; throttle position sensor that is faulty; catalytic converter that is faulty; and PCM is faulty (not common). Due to the large number of possible causes for the code having set in your car, it is recommended that you request a misfiring diagnostic during which the responding certified mechanic will use a "decision tree" to sequentially and methodically go through all of the listed possibilities until the fault is identified. Once the fault is identified, the mechanic will let you know of any required parts and the cost to install the part(s).

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

Q: Can Ignition Problems Cause Engine Misfires?

Faulty ignition system components are among the leading causes of engine misfires. Parts such as spark plugs, spark plug wires and boots, and ignition coils are highly stressed by high voltage and a high underhood temperature environment. While most of...

Q: Hard to turn steering wheel after power steering pump replaced

Hi Elaine. Thanks for contacting us tonight. Sometimes after a power steering pump is installed, reduced pressure inside the hydraulic lines will build, which can create the symptoms you're experiencing. IIn other cases, low power steering fluid levels can cause...

Q: Idling while driving

The main issue you have here is the number of miles on your car. With this many miles, most cars would have been completely worn out. Unless you have taken meticulous car of your car, it is often necessary to...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...