Skip the auto shop - Our mechanics make house calls

Q: My 2000 ford expedition is showing 0171 and 0174 codes do you have a estimate to fix?

asked by on

Would not pass test

My car has 210000 miles.
My car has an automatic transmission.

A: The codes P0171 and P0174 point to a lean c...

The codes P0171 and P0174 point to a lean condition picked up by the oxygen sensors in the vehicle's exhaust system. Since there is a warning from both banks, it may be safe to say that this is could be due to a vacuum leak. The leak may be in the area of the intake manifold or throttle body. Have a certified technician diagnose the cause of the Check Engine Light codes thoroughly in order to get a more clear estimate on the cost for repair.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: I have a 2003 Ford Expedition 5.4 liter my reverse just stopped working all of my other gears work fine including Overdrive dude w

Even with the fluid appearing to be in good condition, something inside the transmission may have failed. The valve body is comprised of multiple passages of different length and diameter to control fluid pressure to each gear. If the reverse...

Q: I failed a smog check with the codes PO171 & PO174, saying the system is too lean on the bank 1 & 2. Can you tell me what the problem is?

Hi there. When the two codes P0171 and P0174 come up for a lean system on both banks of your engine, then either all of the fuel injectors are not working properly or your fuel pressure has dropped. Check the...

Q: Brake pedal feels spongy.

The feeling of a spongy pedal indicates old brake fluid and/or air in the brake system of your Navigator. While it was mentioned that the master cylinder was replaced three times, more information is still necessary for a proper diagnosis...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.