Q: Codes P0171 and P0174

asked by on

I have codes P0171 and P0174 on my code reader.

Codes P0171 and P0174 pertain to the engine running lean on both bank one, and bank two, meaning that both sides, or the complete engine, is running lean. The lean condition could be one of several possible causes. The intake gasket could be leaking, in which case, the intake has to be removed, and the gaskets replaced. The number six and eight injectors could be crossed, or the o-ring seal on the brake master cylinder is faulty. Lastly, the injectors could have deposits built up, in which case they would need to be cleaned or replaced. I recommend having a mechanic, such as one from YourMechanic, scan and check these components to see if they need service.

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 P0171 and P0174

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: When backing up, my car makes a rocking noise.

The noise is the parking brakes are out of adjustment and the brakes are dragging. Check the rear brakes and see if they are releasing when going in reverse. If you need further assistance with your brake system, then seek...

Q: Dodge ram misfires only when I do a cold start?

Hello, As you may know, there are a number of things that can cause a misfire ranging from faulty ignition parts to changes in air/fuel mixture, fuel pressure, timing an the list goes on. If you do know you have...

Q: Rough idle after replacing Mass Air Flow Sensor - trouble codes P0171 and P0102

The P0171 refers to a possible lack of fuel pressure, a leak in the intake air system, or a possible vacuum leak. The P0102 also leans towards a leak in the intake air system. It is possible that there is...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...