Fixing P0171 engine code for a Car

It can be one thing to buy a vehicle and another to maintain it. A check engine light is worrying, let alone a P0171 code that you don’t understand. Here we cover all the basics of fixing the P0171 engine code of a Chevy, Ford, Toyota, or Nissan, whichever vehicle you may have.

Summary

Fixing a P0171 engine code in a Chevy, Ford, & Toyota is done with a diagnostics car code reader to figure out why it’s giving you a “system too lean (bank 1)” code. The most common reasons for a P0171 code are a fuel pump issue and a faulty mass airflow sensor. The cost of fixing a P0171 engine code usually ranges between $100 and $1,700, depending on the issue.

In this article, we also go over the following:

  • The severity of the issue
  • Symptoms to look out for
  • Best ways to deal with the P0171 code

Diagnosing code P0171

There are simpler ways to diagnose this code without having to call a mechanic and spend extra bucks. Here are some products to help you out.

Code reader

Determine the cause of your engine light with this diagnostic tool. Its super-easy to use.

It can read and erase codes as well freeze frames. You can get engine speed, coolant temperature, calculated load value, and more. There is also no need for a charger or battery. The tool gets the current directly from your vehicle through the OBDII data link connector. The scanner is very much portable and has a 2.5 feet long cable.

BrandMOTOPOWER MP69033 Car OBD2 Scanner
ColorYellow
Display resolution128 x 64
Item Dimensions LxWxH6.02 x 2.75 x 0.91 inches
Power SourceBattery Powered
Screen Size2.7 Inches
Special featureAcrylic screen cover

Pros

  • You’ll find very few devices at such a good price.
  • It works on cars built after 1996.
  • We love the value of the price point of this thing.
  • It gets the job done easily.

Cons

  • It’s not a high-end device.
  • A person with a 1998 car reported it not working as intended.
  • You can get a free reading at Autozone.
Sale
Code reader
Get this code reader.

Universal scanner

A trusted tool by more than 35000 customers, this scanner has it all. Recommended by popular YouTuber and mechanic Scotty Kilmer, it boasts exceptionally accurate and speedy results. The large screen and long cable are an asset, making it the professional’s first choice. Unlike other scanners, this is universal and compatible with OBDII protocols. The speed and accuracy are unmatched and thus rated 4.6 stars.

BrandANCEL AD310
Item Weight‎9.6 ounces
Package Dimensions‎9.17 x 6.34 x 1.42 inches
Power SourceBattery Powered
Screen Size1.4 Inches

Pros

  • It’s a much higher-end device.
  • It’s very versatile.
  • it’s a significant step up from the other two devices included.

Cons

  • It’s significantly more expensive.
ANCEL AD310
It's very affordable.

New model Scan tool

It is a 5-year warranty tool that boasts of the airbag, ABS/SRS/Transmission diagnostic all in one. Apart from reading and erasing codes and viewing freeze frames, it has an:

  • O2 sensor test
  • an EVAP test of the fuel tank
  • and more

It even has live data graphing, a huge graphic screen, and a printing function for the best of experiences. It’s the perfect gift for any car owner so they can always stay on top of their vehicle’s needs.

BrandLAUNCH OBD2
Item Weight‎1.41 pounds
Product Dimensions‎9.06 x 1.77 x 7.8 inches

Pros

  • It’s even cheaper than the previously suggested product.
  • It’s good for a cheap OBD scanner.
  • It can reset codes.
  • It’s easy to use.

Cons

  • When testing it, we had some issues with the live data graphs menu.
  • You may have needs requiring you to invest in a more advanced unit.
  • A user received one with a cracked screen.
LAUNCH OBD2 Scanner
It's a step up.

How do I fix codes P0171 and P0174?

There are a couple of steps to follow to diagnose and fix both codes:

Figure out components

If both codes are showing at the same time, figure out which components are affected uniformly in both cylinders or banks. These components include the:

  • MAF sensor
  • a clogged fuel filter
  • and the fuel pressure regulator.

Use a scan tool

Using a diagnostic tool to find the source of the problem is certainly very handy. It can point to the oxygen, MAF sensors, or any other part that is the origin of the code.

Model issues

Sometimes the issue is particular to the vehicle itself. The Buick Encore and Honda CRV or Lexus will have their manuals and causes for a code. Check the manual and try to find the source of the issue.

Check the MAF and throttle body.

The MAF sensor is a very common problem but it can be tested easily. If your Nissan Altima, Honda Accord, or Subaru is flailing in engine power or idling roughly, you should check out the MAF sensor first. If you’re finding the fuel being used up quickly, clean the MAF sensor and consider replacing it if it still doesn’t work.

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