Q: Codes po171, po174, po303, po741

asked by on

I recently had my car tested and it showed the codes above. My service light is on but sturdy. I have lack of lpower and a rough idle. When I stop my car vibrates with surging on the acceleration. Prior to all of this I had spark plugs replaced and the light was still on. I was told that po352 was misfiring and had a front ignition coil replaced. I am still have problems. My car has been running great. I keep maintenance on my car but all this is new and I am a female, veteran as well as a senior citizen this is the only transportation I have and I want my car running smooth again. Please provide me with a solution I am so appreciative.

My car has 96700 miles.
My car has an automatic transmission.

First, I would like to thank you for your service. I am also a veteran. Lets look at each code and their meaning first. Code P0741 is for a problem in the torque converter clutch seal in the transmission and requires the transmission to be removed and seals or components replaced as needed after inspection.

Code P0303 is a cylinder number 3 misfire and may be the spark plug, wire, or coil causing the misfire.

Codes P0171 and P0174 are for the engine on both banks 1 and 2 running too lean. This shows you may have a vacuum leak in the intake manifold or one of the hoses to the intake manifold. The code you had before P0352 was for an ignition coil problem. It looks like you have a few different problems that will need to be looked at by a qualified mechanic. I hope this will help you decide on a repair path for the codes you have. If you still need help, have a technician from YourMechanic come to your home or office to diagnose your Check Engine Light codes and make the correct repairs.

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
  1. Home
  2. Questions
  3. Codes po171, po174, po303, po741

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: My traction control is off and half of the engine doesn't work, I hooked up a computer to it and the P0800 code is on

Hello, thanks for writing in. P0800 is the trouble code for an issue with the vehicle's Transfer Case Control system. When the transfer case control module, a computer that is separate from the engine computer, detects an issue with the...

Q: Temperature reading hot cold air blowing out of vents both side set at 90 degrees. Northstar will I blow a head gasget??

Hello. It is likely if the vehicle is getting progressively hotter, that it is going to overheat sooner or later. The head gasket is one of the several components that can be a factor, but you will want to test...

Q: how munch does the rear differential hold?

Hello there, the fluid capacity of your 2002 Chevy Silverado 3500 rear differential is determined by a few different factors. The normal capacity is approximately 4 quarts. This changes based on if your truck is equipped with the limited slip...

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 Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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.