Guide To P0174 OBD Error Code Solutions

<<See All OBD Codes

The fault code P0174 can be defined as system too lean bank 2. This would mean that there is incorrect ratio of air and fuel in the car engine system, specifically on bank 2 of the cylinder. The “too lean” would mean that there is large amount of oxygen in the exhaust. The vehicles which have V6/V8/V10 engines, there bank 2 is situated on the side of the engine which do not have cylinder #1.

The fuel delivery system adaptive fuel strategy is constantly monitored by the powertrain control module to ensure good working condition on the engine at the most favorable air to fuel ratio of 14:7:1. The injector pulse is automatically adjusted by the computer to help regulate the amount of fuel that would be sent to the engine.

What causes this problem with the System Too Lean (Bank 2)?

• There can be air leak after the mass air flow sensor, such as a torn intake boot, or bad intake manifold gaskets
• There can be some faults in the mass air flow sensor
• Defaults in the oxygen sensor
• The fuel pressure might not be correct
• Leaking positive crankcase ventilation valve
• There can be clogged exhaust gas recirculation port
• The brake booster might start leaking

1. Engine Control Module - Engine Control Module is an important car part which should never be neglected. May be there is some fault in it due to which P0174 code may start flashing.
2. Mass Air Flow Sensor - Is your Mass Air Flow Sensor damaged or broken? Don’t worry as we have solutions for all your problems.
3. Intake Manifold Gaskets - Defective car Intake Manifold Gaskets can be a major reason why P0174 code depicts. So, make sure to replace it online so that you don’t have to face any further issues.
4. Oxygen Sensor - Everything is okay with the Oxygen Sensor and still OBD code P0174 triggering? Then there must be some defects in Oxygen Sensor. Replace them as soon as possible.
5. Fuel Pressure - P0174 code flashing? Get your Fuel Pressure inspected from a mechanic.
6. PCV Valve - PCV Valve is an essential car part, that’s why you must take care of it and you can rely on us to purchase best quality PCV Valve online.
7. EGR Valve - There can be some defects in the EGR Valve due to which P0174 code may come on again and again. Make sure to replace it or else you may have to face some major issues.
8. Crankcase Ventilation - Poor Crankcase Ventilation can cause a lot of difficulties, so why not get it replaced at time?
9. Valve Cover Gasket - Are there some faults in your Valve Cover Gasket? Don’t waste time and get them replaced or else P0174 code can turn up.

Willing to know some common symptoms of OBD Code P0174? Your wish is our demand. Have a look at them below:

Common Symptoms

• Overall rise in the fuel consumption
• An illumination in the check engine light
• Rough or high idle
• The car acceleration can start decreasing
• Engine might start stalling

We have listed out some ways which would help you to correct the occurrence of OBD Code P0174. They are mentioned here as follows:

• The mass air flow sensor should be replaced
• Clean the mass air flow sensor
• Restore the faulty oxygen sensor
• You must replace the PCV valve
• The vacuum line should be replaced
• Replacing EGR valve
• Replace the brake booster
• It is very important to replace the valve cover gasket

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of mass air flow sensor cleaner, O2 sensor, air flow meter, carter fuel pump and many more. Now all your problems would vanish within no time.

• First of all, fuel pressure test should be performed
• Then you must check the intake system and vacuum lines for leaks
• The valve cover should be inspected for worn hoses or leaks
• The PCV valve should be inspected properly
• Carefully test the mass air flow sensor with a scan tool or multi meter
• The related oxygen sensor should be tested properly with a scan tool or multi meter

Common Mistakes When Diagnosing The P0174 Code

• The most common mistake can be replacing a component without first deeming it bad through testing
• Failing to check the intake system for tears or leaks

P0171 - System too Lean (Bank 1)

P0172 - System too Rich (Bank 1)

P0175 - System too Rich (Bank 2)