P0171 Hyundai Code - System Too Lean Bank 1
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 Hyundai indicates System Too Lean Bank 1.
- 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 Hyundai 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 Malfunction Indicator Light (MIL) (2 trip detection logic).
What are the Possible Causes of the DTC P0171 Hyundai?
- 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 Hyundai?
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 Hyundai 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.
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Frequently Asked Questions about P0171 Hyundai Code
1. What does OBDII code P0171 for Hyundai indicate?
The OBDII code P0171 for Hyundai indicates a "System Too Lean Bank 1" error, which means that the engine is receiving too much air and not enough fuel.
2. What are the common symptoms of OBDII code P0171 on a Hyundai?
Common symptoms of OBDII code P0171 on a Hyundai include rough idling, poor acceleration, engine misfires, reduced fuel efficiency, and the illumination of the check engine light.
3. What are the possible causes of OBDII code P0171 on a Hyundai?
Possible causes of OBDII code P0171 on a Hyundai include a vacuum leak, faulty oxygen sensor, clogged fuel injectors, dirty mass airflow sensor, fuel pump issues, or a malfunctioning PCV valve.
4. How can I diagnose the OBDII code P0171 on my Hyundai?
To diagnose the OBDII code P0171 on your Hyundai, you can perform a visual inspection for damaged hoses, test the oxygen sensor, clean or replace the mass airflow sensor, check the fuel injectors, and inspect the fuel pump.
5. Can a dirty air filter cause OBDII code P0171 on a Hyundai?
Yes, a dirty air filter can cause OBDII code P0171 on a Hyundai by restricting airflow and causing the engine to run lean. It is recommended to replace the air filter regularly to prevent this issue.
6. How can I repair OBDII code P0171 on my Hyundai?
To repair OBDII code P0171 on your Hyundai, you may need to fix vacuum leaks, replace the oxygen sensor, clean or replace the mass airflow sensor, clean the fuel injectors, check the fuel pressure, and ensure proper PCV valve operation.
7. Is it safe to continue driving with OBDII code P0171 on my Hyundai?
It is not recommended to continue driving with OBDII code P0171 on your Hyundai, as it can lead to engine damage and poor performance. It is advised to address the issue promptly to avoid further problems.
8. Can a bad fuel pump cause OBDII code P0171 on a Hyundai?
Yes, a bad fuel pump can cause OBDII code P0171 on a Hyundai by delivering insufficient fuel to the engine, causing it to run lean. It is advisable to have the fuel pump inspected and replaced if necessary.
9. Will resetting the check engine light fix OBDII code P0171 on a Hyundai?
Simply resetting the check engine light will not fix OBDII code P0171 on a Hyundai. The underlying issue causing the lean condition needs to be identified and repaired for the code to be resolved.
10. How can I prevent OBDII code P0171 from appearing on my Hyundai?
To prevent OBDII code P0171 from appearing on your Hyundai, it is essential to perform regular maintenance, such as replacing the air filter, checking for vacuum leaks, using quality fuel, and ensuring all engine components are in good working condition.
Discuss the causes and fixes for P0171 Hyundai OBDII Code
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Start by checking for intake leaks. Check for loose of cracked engine hoses.
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having the problem with that code ser is there any other way I can be help .. contact me 6463098494 Marco
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I have a 2007 Hyundai Tucson SE and in the last 3 months have had P0171 codes, had the Oxygen Sensor Bank 1 changed and the Check Engine has come on 5 times. I brought it back to the shop because of the same code and the compute diagnostic code showed that the throttle body sensor was bad and the mass air flow sensor "O" ring replaced. Today, the PO171 code came back on and my Tucson is back in the shop.
I have 127,130 miles on it and have never had any other issues with my Tuscson. This is Driving me insane. Any suggestions?
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Unfortunately, diagnosing the P0171 code can be difficult, because the code doesn't specified exactly what the problem is. The P0171 code just indicatea that the engine is running leaner (more air than fuel) than normal. Without doing any test, my only suggestion is to replace the Mass Air Flow (MAF) sensor. Based on a national database of repairs for the P0171 code, 80% of the times the problem was the MAF and 15% the Oxygen Sensor.
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2004 Santa Fe 2.7 had no codes or performance issues. Replaced gas tank that was leaking due to rust. Now have PO171 and PO174 codes. Replaced Mass Air Sensor, and a sticky Idle Air valve. there are no discernible vacuum leaks anyplace. Any idea where to go from here?
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Most of the times is the Mass Air Flow (MAF) Sensor, but according to a national database of repair, if the MAF it's OK, then the other common problems when those two codes are present is the intake boot (the large hose or tube that connects to the throttle body) or the Oxygen Sensors.
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I have an 07 Hyundai Tucson. I have replaced spark plugs, oil, catalytic convertor (it was blocked), both upstream and downstream 02 sensors, MAF. I had 6 codes and now I'm down to two.... P0170 and P0171. ive checked most of the hoses. I am at a loss.
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Hello Daniel. Let me check if I can find more information. What is the engine size of your Tucson, 2.0L or 2.7L?
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Other than the components you have replaced, the only thing I found that could set the code is the fuel delivery. Either you have a problem with the fuel pump or you have clogged fuel injectors. You could start by running a fuel additive to clean the injectors and/or check the fuel pressure with the a fuel gauge.
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This error came up on my wife's 2005 Tuscan (V6) after she accidentally put 91 octane premium gas in instead of 87 octane regular. She used up that tank and refiled with no issues (check engine light turned off) but the light went back on after the next time she filled up again.
My immediate thought is that it's a fuel mixture issue. I'm just curious what others think?
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You shouldn't get a code for using higher octane gas or mixing the gas, in fact we recommend 91 octane if possible. Most vehicles have a system that adjust itself, it is possible that your vehicle is adjusting itself to the different gas. Try just clearing the code for now.
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