P0174 Explained - System TOO LEAN (Bank 2) |

The P0174 code indicates that the O2 sensor on bank 2 has detected a too lean air-fuel mixture. When this imbalance exceeds the O2 sensor’s ability to correct it (beyond ±15%), the P0174 code is triggered.
Here are the symptoms and potential causes:
Symptoms:
Check engine light
Rough idle
Decreased fuel consumption
Hiccups during acceleration
Causes:
Faulty MAF Sensor: Clean or replace the Mass Air Flow (MAF) sensor.
Vacuum Leak: Inspect and repair vacuum hoses.
Boost Pipe Leaks: Check for leaks in the boost pipes.
Low Fuel Pressure: Address issues with the fuel pump or clogged fuel filter.
Faulty O2 Sensor (Bank 2): Replace the oxygen sensor on bank 2.
Faulty PCV Valve: Replace the Positive Crankcase Ventilation (PCV) valve.
Intake Manifold Gasket: Inspect and replace if necessary.
Repairs:
Clean or replace the MAF sensor.
Repair vacuum leaks.
Replace the fuel filter.
Address fuel pump issues.
Replace the O2 sensor on bank 2.
Check and replace the PCV valve.
Inspect and replace the intake manifold gasket.
Remember not to make full acceleration pulls if you experience this trouble code. Drive carefully to the workshop for repairs. 🚗💨
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Search terms and questions you might be thinking of related to P0174 Explained - System TOO LEAN (Bank 2):
P0174 code
Lean running condition
O2 sensor
Bank 2
MAF sensor
Vacuum leak
Fuel pressure
Oxygen sensor
PCV valve
Intake manifold gasket
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[@danntikofi2722]

Thanks for your recommendation , and My question is that can you clean the throttle body and change the spark plugs too?

[@weeklytools]

You are most welcome sir. Certainly! Maintaining your vehicle’s throttle body and spark plugs is essential for optimal performance. Let’s break it down:
Cleaning the Throttle Body:
The throttle body controls the amount of air entering the engine. Over time, carbon deposits can accumulate, affecting airflow and engine performance.
To clean the throttle body:
Step 1: Remove the air intake hose connected to the throttle body.
Step 2: Use a throttle body cleaner (specifically designed for fuel system components) to spray and clean the interior surfaces of the throttle body.
Step 3: Wipe away any residue with a clean cloth.
Step 4: Reattach the air intake hose.
It’s recommended to perform this maintenance roughly every 100,000 miles1.
Changing Spark Plugs:
Spark plugs play a crucial role in igniting the air-fuel mixture in the combustion chamber.
To change spark plugs:
Step 1: Locate the spark plugs (usually on the engine cylinder head).
Step 2: Use a ratchet wrench and spark plug socket to remove the old spark plugs.
Step 3: Inspect the spark plugs for wear or fouling. If needed, replace them with new ones.
Step 4: Gap the new spark plugs (adjust the electrode gap to the manufacturer’s specifications).
Step 5: Reinstall the spark plugs.
Regularly replacing spark plugs ensures efficient combustion and better fuel economy2.
If you’d like more detailed instructions or have any specific questions, feel free to ask! 😊