OBD code P0174 indicates a lean condition in bank 2 of the engine.
This affects the fuel system.
Symptoms include the Check Engine light on, increased fuel consumption.
Causes may include dirty air filter, faulty MAF sensor, intake/exhaust leaks, fuel contamination, or misfiring.
It’s a moderate issue that can affect engine performance.
To fix, inspect and clean/replace components like the MAF sensor, air filter, and check for leaks.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
Symptoms of the p0174 OBD Code
The vehicle may exhibit a lean condition on bank 2 of the engine.
- With OBD code P0174, the engine light will be ON.
- Excessive fuel consumption may be noticed.
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Causes of the p0174 OBD Code
Possible reasons for fault code P0174 include vacuum leaks, faulty MAF sensor, or fuel delivery issues.
- P0174 can be caused by a Dirty or Restricted Air Filter.
- A Dirty or Faulty Mass Air Flow (MAF) Sensor.
- Intake Air Leaks.
- Exhaust Gas Leaks.
- Fuel Contamination.
- Faulty or Clogged Fuel Injectors.
- Faulty Front Heated Oxygen Sensor.
- Ignition Misfiring.
- Low Fuel Pressure.
- Positive Crankcase Ventilation (PCV) Hose Leaks.
Fixing Error Code p0174 Step By Step
Addressing a vacuum leak or faulty mass airflow sensor typically resolves P0174.
- To fix OBDII code P0174, first, review the ‘Possible Causes’ mentioned above and visually examine the corresponding wiring harness and connectors.
- Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Next, perform a thorough inspection of the intake system for any vacuum leaks, especially around the intake manifold gaskets.
- Check the fuel pressure to ensure it meets the manufacturer’s specifications.
- Clean or replace the Mass Air Flow (MAF) sensor if necessary.
- Finally, reset the vehicle’s Engine Control Module (ECM) to clear the code and monitor the system for any reoccurrence.
Cost Of Fixing p0174 Fault Code
Diagnosing and repairing fault code P0174 typically involves inspecting for vacuum leaks and faulty oxygen sensors.
The cost to diagnose and fix OBD code P0174 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
Costs depend on labor rates, shop fees, and the complexity of the repair needed.
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Details of the p0174 OBD Code
P0174 indicates a lean condition in bank 2 of the engine.
OBD code P0174 means that the system is detecting a lean condition in bank 2 of the engine.
This code is triggered by the Engine Control Module (ECM) based on the oxygen sensor readings indicating that there is too much oxygen in the exhaust gases compared to the amount of fuel being supplied.
This typically points to a vacuum leak, faulty fuel injector, or a problem with the Mass Air Flow (MAF) sensor on that bank of the engine.
Mechanic’s Tech Notes
Code P0174 indicates a lean condition on bank 2 of the engine, typically caused by a vacuum leak.
To diagnose and fix OBDII code P0174 (System Too Lean Bank 2), start by checking for vacuum leaks in the intake system, especially around the intake manifold gaskets.
Use a smoke machine or propane enrichment method for detection.
Inspect the Mass Air Flow (MAF) sensor for contamination or malfunction.
Test the fuel pressure to ensure it meets specifications.
Verify the functionality of the oxygen sensors, particularly the one on Bank 2. A voltmeter can be used to check sensor voltages.
Additionally, scan tools can monitor fuel trims to pinpoint the issue accurately.
Addressing these areas can help resolve the P0174 fault code.
FAQ
Common causes of OBD code P0174 include dirty air filter, faulty MAF sensor, intake/exhaust leaks, fuel contamination, faulty O2 sensor, misfires, low fuel pressure.
Diagnose lean condition code P0174 by checking air filter, MAF sensor, intake/exhaust leaks, fuel system, oxygen sensor, ignition, and PCV system. Inspect wiring/connectors for damage/corrosion.
Address the P0174 fault code immediately. Continuing to drive may lead to engine damage. Check for air filter, MAF sensor, intake/exhaust leaks, fuel system issues.
Wrap Up
If your check engine light is on and you’re experiencing poor fuel economy with OBDII code P0174, it may be caused by a vacuum leak, faulty oxygen sensor, or a clogged fuel filter.
These issues can lead to a lean condition in bank 2 of the engine.
To address P0174, check for vacuum leaks in the intake system, test the oxygen sensor’s operation, and replace the fuel filter if necessary.
Inspect the intake manifold gaskets and ensure proper fuel pressure for optimal engine performance.
