P0171 Scion Code - Fuel Trim System Too Lean Bank 1
Quick Answer
The P0171 code for Scion vehicles indicates that the fuel trim system on bank 1 is reading too lean. Common causes include Vacuum leaks, Faulty mass airflow sensor, Clogged fuel filter. 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 Scion indicates Fuel Trim System Too Lean Bank 1.
- Common causes
- Common causes include Vacuum leaks, Faulty mass airflow sensor, Clogged fuel filter.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0171 Scion Description
The P0171 code for Scion vehicles indicates that the fuel trim system on bank 1 is reading too lean. This means that the engine is receiving too much air and not enough fuel, resulting in a lean air-fuel mixture. The fuel trim system is responsible for adjusting the air-fuel mixture to ensure optimal combustion and engine performance. When the system detects that the mixture is too lean, it will trigger the P0171 code to alert the driver or technician of the issue.
Common Causes of P0171 Scion
- Vacuum leaks
- Faulty mass airflow sensor
- Clogged fuel filter
- Malfunctioning oxygen sensor
- Issues with fuel injectors
Symptoms of P0171 Scion
- Rough idle or stalling
- Hesitation or lack of power during acceleration
- Check Engine Light illuminated
- Increased fuel consumption
- Engine misfires
How to Fix P0171 Scion
- Start by checking for vacuum leaks using a smoke machine or a can of carburetor cleaner to locate any leaks.
- Inspect the mass airflow sensor for dirt or damage, clean it if necessary, or replace it if faulty.
- Replace the fuel filter to ensure proper fuel flow to the engine.
- Test and replace the oxygen sensor if it is not functioning correctly.
- Clean or replace the fuel injectors to ensure they are delivering the correct amount of fuel to the engine.
Cost to Fix P0171 Scion
The typical repair costs for resolving a P0171 code on a Scion vehicle can range from $100 to $500, depending on the specific cause of the lean condition and the cost of parts and labor. Additional costs may apply if any components need to be replaced. It is recommended to consult with a qualified mechanic to diagnose the issue accurately and provide an exact cost estimate for the repair. Keep in mind that labor rates can vary based on location and the type of repair shop.
Tech Notes for P0171 Scion
Need more information about the P0171 Scion code?
Need more information on how to fix the P0171 Scion code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0171 Scion code diagnosed by a professional: Find a repair shop in your area
Information for Specific Scion Models
- P0171 2005 Scion xB — Air/Fuel Mixture System Lean Bank 1
- P0171 2006 Scion xB — Air/Fuel Mixture System Lean Bank 1
- P0171 2007 Scion xB — Air/Fuel Mixture System Lean Bank 1
Frequently Asked Questions about P0171 Scion Code
1. What are the common symptoms of OBDII code P0171 in a Scion?
- Common symptoms of code P0171 in a Scion include rough idling, poor fuel economy, hesitation or stalling during acceleration, and the illumination of the Check Engine Light.
2. What does the OBDII code P0171, indicating "Fuel Trim System Too Lean Bank 1," mean for a Scion?
- Code P0171 in a Scion signifies that the engine control module has detected a lean air-fuel mixture on bank 1 of the engine. This can lead to inefficient combustion and potential engine performance issues.
3. What are some possible causes of code P0171 in a Scion?
- Common causes of code P0171 in a Scion include a vacuum leak, faulty oxygen sensor, dirty or clogged fuel injectors, a malfunctioning mass airflow sensor, or a weak fuel pump.
4. How can I diagnose the cause of OBDII code P0171 in my Scion?
- To diagnose code P0171 in a Scion, you can start by inspecting for any visible vacuum leaks, checking the oxygen sensor and mass airflow sensor readings, testing the fuel pressure, and inspecting the fuel injectors for blockages.
5. Is it safe to continue driving my Scion with OBDII code P0171 present?
- While you may still be able to drive your Scion with code P0171, it is not recommended as it can lead to poor engine performance, reduced fuel efficiency, and potentially cause damage to the catalytic converter over time.
6. How can I repair OBDII code P0171 in my Scion?
- Repairing code P0171 in a Scion typically involves fixing the root cause of the lean condition, such as replacing a faulty oxygen sensor, repairing vacuum leaks, cleaning or replacing fuel injectors, or addressing issues with the mass airflow sensor.
7. Can a dirty air filter trigger OBDII code P0171 in a Scion?
- Yes, a dirty air filter can restrict the airflow into the engine, causing a lean condition and potentially triggering code P0171 in a Scion. It is recommended to check and replace the air filter if necessary.
8. Will resetting the Check Engine Light resolve OBDII code P0171 in a Scion?
- Simply resetting the Check Engine Light will not fix the underlying issue causing code P0171 in a Scion. It is essential to diagnose the problem, make necessary repairs, and clear the code using a diagnostic scanner.
9. Are there any maintenance tips to prevent OBDII code P0171 in a Scion?
- To help prevent code P0171 in a Scion, perform regular maintenance such as changing the fuel filter as recommended, keeping the air filter clean, using high-quality fuel, and addressing any engine performance issues promptly.
10. Can a faulty fuel pressure regulator cause OBDII code P0171 in a Scion?
- Yes, a faulty fuel pressure regulator can disrupt the proper fuel delivery to the engine, leading to a lean air-fuel mixture and triggering code P0171 in a Scion. It is advisable to have the fuel pressure regulator inspected and replaced if necessary.
Discuss the causes and fixes for P0171 Scion OBDII Code
-
I have a 2010 Scion xB and cannot for the life of me get rid of the P1071 code system bank too lean code. I have replaced the mass air flow sensor (Walker brand name) replaces the gaskets, metal one in the front and under the head as well as the intake manifold gasket. I have also replaced the throttle body. The code will not go away. Just ordered new injectors (Denso Brand) re ordered the Denso MAF Sensor to see if replacing the sensor is the issue. Need major help!!!
-
Have you replace the Oxygen Sensor? For you model year the Oxygen Sensor is one of the most common problems that will set the P0171 code.
-
I have never had that problem before, usually the Oxygen Sensor or MAF will take care of the problem.
Here is a list of the most common solutions, according to a national database of repairs for you model and year. I hope that helps- Oxygen Sensor - 68 times
- Mass Airflow Sensor - 56
- Fuel Pump - 26
- Spark Plug - 14
- EVAP Purge Solenoid Valve - 10
- Positive Crankcase Ventilation Hose - 6 -
Got a ??? Codes saying lean bank large leak and every time I put gas it does not start on the first turn over anybody who can help out thanks
Code p1071 someone said replace the fuel pump is that the only thing it can be ????? -
There are many things that could set the P0171 code, the fuel pump is not the most common problem. Let me check if I can find more information, what model and year is your Scion?
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.