P0171 Mitsubishi Code - System Too Lean Cylinders 1-4
Quick Answer
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0171 Mitsubishi indicates System Too Lean Cylinders 1-4.
- Common causes
- Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0171 Mitsubishi Description
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).
What are the Possible Causes of the DTC P0171 Mitsubishi?
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
How to Fix the DTC P0171 Mitsubishi?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0171 Mitsubishi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0171 Mitsubishi code?
Need more information on how to fix the P0171 Mitsubishi code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0171 Mitsubishi code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0171 Mitsubishi Code
1. What are the common symptoms of OBDII code P0171 (System Too Lean Cylinders 1-4) in a Mitsubishi?
Common symptoms include rough idle, loss of power, engine hesitation, poor fuel economy, and the illumination of the check engine light.
2. What are the possible causes of OBDII code P0171 in a Mitsubishi?
Possible causes include a vacuum leak, faulty oxygen sensor, dirty or clogged fuel injectors, a malfunctioning mass airflow sensor, or a fuel delivery issue.
3. How can I diagnose the cause of OBDII code P0171 in my Mitsubishi?
Diagnosing the issue may involve checking for vacuum leaks, inspecting the oxygen sensor, cleaning or replacing fuel injectors, testing the mass airflow sensor, and ensuring proper fuel pressure.
4. Can a dirty air filter trigger OBDII code P0171 in a Mitsubishi?
Yes, a dirty air filter can restrict airflow to the engine, causing a lean fuel mixture and triggering code P0171. Regular air filter maintenance is important for optimal engine performance.
5. Is it safe to continue driving my Mitsubishi with OBDII code P0171 present?
It is not recommended to drive with code P0171 unchecked, as it can lead to engine damage over time. Addressing the issue promptly can prevent more serious problems and improve overall vehicle performance.
6. How can I fix OBDII code P0171 in my Mitsubishi?
Repair options may include fixing any vacuum leaks, replacing the oxygen sensor, cleaning or replacing fuel injectors, cleaning the mass airflow sensor, and ensuring proper fuel system operation.
7. Will resetting the check engine light resolve OBDII code P0171 in my Mitsubishi?
Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing P0171. It is important to diagnose and address the root cause of the problem to prevent future occurrences.
8. Can extreme weather conditions trigger OBDII code P0171 in a Mitsubishi?
Extreme weather conditions can exacerbate existing issues that may trigger code P0171, such as causing vacuum leaks to worsen or affecting sensor performance. It is important to address any underlying problems regardless of weather conditions.
9. How do I prevent OBDII code P0171 from recurring in my Mitsubishi?
Regular maintenance, such as replacing the air filter, checking for vacuum leaks, using high-quality fuel, and following the manufacturer's recommended service schedule, can help prevent code P0171 from recurring.
10. Will using fuel additives help resolve OBDII code P0171 in my Mitsubishi?
While fuel additives may help clean fuel system components, they are not a guaranteed solution for resolving code P0171. It is best to diagnose the specific cause of the issue and address it accordingly for a lasting fix.
Discuss the causes and fixes for P0171 Mitsubishi OBDII Code
Code P0171 Mitsubishi comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
