Skip the auto shop - Our mechanics make house calls

Q: Does the mechanic do a scan or a diagnostic? I've done the scan and received a code, just need a more thorough diagnosis

asked by on

I need a full diagnostic on my truck. I've scanned and got code P0200 but I need to know which injector is misfiring

My car has 300 miles.
My car has an automatic transmission.

On a preliminary basis, if you are just curious, you can use a mechanic’s stethoscope to listen to each injector as it pulses and try to hear a difference amongst them. Also, you could probe the terminals on the solenoid coil of each injector to see if the resistance of any are out of specification (varies with temp.) Of course, you could use a scope, too, to quickly identify the cylinder(s).

If you have an injector problem, please keep in mind, the best results by far will be obtained if ALL injectors are removed and sent to a rebuilder. They will test and most importantly clean all and REPLACE the internal filters. Don’t bother with aftermarket cleaners. Injectors have filters that get clogged and the only way to properly service then is on a specialized machine that cleans them typically ultrasonically. Typically the cost is around $15 or so per injector. If you have one out for service or replacement, then all of them should be serviced to eliminate future headaches. If you would like to have all of this taken care of for you, a certified technician from YourMechanic can come to your home or office to diagnose the code more thoroughly and assist with correct repairs.

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
  • Home
  • Questions
  • Does the mechanic do a scan or a diagnostic? I've done the scan and received a code, just need a more thorough diagnosis

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: Park assist issues

Hi there, thanks for writing in. I'd be happy to provide my insight. I have seen this happen with the same errors when the object detection module is faulty. The "incompatible equipment on sensor" code relates to the fact that...

Q: My car had a rough idle, and if I sit at a red light or let the car run in idle for a few minutes my check engine light starts to

A dead misfire on a single cylinder may be deeper than just a spark plug. If the compression for that cylinder is very low, the cylinder cannot fire. Low compression would be caused by worn piston rings. Also, if the...

Q: Pinion bearing making noise

The pinion bearing is a common issue with Ford rear ends. Most of the time, this failure is due to a differential leak that was not addressed and the bearing run dry. I recommend having a trained technician, such as...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...