Q: Truck runs smoothly with no misfires but CEL is on and bank 1 is running too lean.
I have a 2005 ford F150 (5.4L 3-valve Triton V8). Last week my check engine light came on. took it to autozone to get the OBD reader on it. there were multiple piston misfires. I got all new spark plugs and all new ignition coils, and replaced them all myself (didn't break a single plug) and today I took it up to autozone AGAIN because my CEL came back on. Now they're saying my fuel filter is bad and I need a new one. No big deal it's $20. and they also said bank 1 is running too lean. Possible cause was labeled as a bad MAF sensor. I've spent about 5 hours on the internet gathering as much knowledge I can about this P0171 thing but I need the opinion of someone who knows about this kind of stuff.
My car has an automatic transmission.
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
What others are asking
What Dangers Are Caused by Hanging Things From the Rearview Mirror?
The first danger that should be considered is the fact that items on the rearview mirror (https://www.yourmechanic.com/article/is-it-dangerous-to-hang-something-from-the-rearview-mirror) are a distraction. Depending on the object they can partly obscure your view. Visibility is a main concern as well as depending on...
Loss of power and speed
The timing has jumped. Timing is the most common issue with the engine (https://www.yourmechanic.com/article/how-does-a-timing-chain-work). The timing chain guides and tensioners on these engines have chain guides with teflon plastic parts that start falling apart, which causes the timing chain to...
My car needs a new water pump but what else should be replaced?
If the car is overheating or the rate of coolant loss is so high that it will likely overheat (https://www.yourmechanic.com/services/car-is-overheating-inspection), you should not drive it because overheating will damage the engine. The most common related services accompanying water pump replacement...
What are the uses of the ABS module?
Hello. Your car is equipped with wheel speed sensors (https://www.yourmechanic.com/services/wheel-speed-sensor-replacement) at each of the four wheels which monitor wheel speed while relaying this information constantly to the ABS and traction control system which are controlled by the car's ECU. When...
wippers stopped working checked fuse seams ok
The recommended diagnostic is a non-working wiper inspection (https://www.yourmechanic.com/services/wipers-are-not-working-inspection). The mechanic would determine if power is reaching the wiper motor when the steering column mounted switch is in the "on" position. If there is power to the motor, and yet...
CODE;EGR LOW FLOW
Typically, on this engine there will be a blockage, consisting of hard packed carbon, in the passageway in the plenum. It can be very difficult to clean out those passageways on the vehicle without removing the aluminum plenum for a...
It is a 320d and it doesn't start by itself in the morning unless I tow it.
Check the battery in the car. The battery may not have the amount of charge that is needed to start the diesel engine. A diesel engine requires more battery power to start it as the compression is higher than a...
Squeaking noise comes from wheels as it spins.
If the noise does not exist with the vehicle stopped (i.e., due to engine noise), then it is likely due to wheel bearings or the brakes. If brake related, unfortunately these sorts of noises can be related to the use...
Would a content 4g64 engine from a 2001/2 Mitsubishi mirage bolt snap into a 2002 lancer Rally oz
Hi there. Unfortunately, engine swaps is not a service we offer at YourMechanic.com, as such; we're not able to offer advice on whether or not this engine will fit your application. I would advise you contact a local engine replacement...
Related articles
2012 Ford Fusion vs. 2012 Toyota Camry: Which Should I Buy?
While most people believe that domestic sedans just cannot compete with the Honda Accord and the Toyota Camry, the industry leaders, that is not necessarily true. Yes, there are some metrics where the Camry just excels, however the Ford Fusion...
The Best Used Cars to Buy If You Just Retired
Here’s Here’s a cruel, hard fact – car manufacturers no longer target seniors. Instead, they devote their time and energy to appealing to the 18-45 demographic. Still, some features make certain cars more suitable for older drivers. We have evaluated...
The Best Used Cars to Buy If You're a General Contractor
If If you're a general contractor, you probably aren’t in the market for a used car. More likely, you’re looking for a pickup truck, because you need to haul equipment and supplies to various job sites. Most contractors will likely...
Browse other content
Services
Maintenance
Cities