PO 171 & 174 (Running too lean)

[Andra]

Can someone tell me how to fix this code? OBD II says code 171 running too lean bank 1 and code 174 running too lean bank 2. Is this a simple adjustment or do I need a diagnostic machine to adjust the air/fuel ratio? Would a tune up help?

Any advice is appreciated.

[cobradude360]

yes i would say it would help cuz more then likely ur plugs are fouled

[ghost1977]

Originally Posted by Andra

Can someone tell me how to fix this code? OBD II says code 171 running too lean bank 1 and code 174 running too lean bank 2. Is this a simple adjustment or do I need a diagnostic machine to adjust the air/fuel ratio? Would a tune up help?

Any advice is appreciated.

fuel filter

[2OOOLS]

Originally Posted by Andra

Can someone tell me how to fix this code? OBD II says code 171 running too lean bank 1 and code 174 running too lean bank 2. Is this a simple adjustment or do I need a diagnostic machine to adjust the air/fuel ratio? Would a tune up help?

Any advice is appreciated.

Fuel System DTC Reference list:

--BANK 1 = DTCs P0171 (lean) and P0172 (rich)
--BANK 2 = DTCs P0174 (lean) and P0175 (rich)

-Check intake air system for leaks, obstructions and damage.
-Check air cleaner element, air cleaner housing for blockage.
-Verify integrity of the PCV system.
-Check for vacuum leaks.

Are any of the above concerns present?

2OOOLS

PS.Also see the following:



hope this will help,
2OOOLS

[JianJeff]

You need to replace the Mass Airflow Sensor. The MAS is located on the air intake tube between the air filter canister and the engine. I would also highly recommend replacing the O2 sensor too. The O2 sendor is located in the exhaust pipe so change it when the engine is cool.

Once yo have replace the MAS then you need to disconnect the battery for 5 - 10 minutes to allow the codes to be erased... unless yo uhave a code reader to erase them.

[reekor]

I wouldn't jump into replacing the Mass Airflow Sensor. before I tried to clean it first. But yes this is a common problem for triggering PO 171 & 174 codes.

Originally Posted by JianJeff

You need to replace the Mass Airflow Sensor. The MAS is located on the air intake tube between the air filter canister and the engine. I would also highly recommend replacing the O2 sensor too. The O2 sendor is located in the exhaust pipe so change it when the engine is cool.

Once yo have replace the MAS then you need to disconnect the battery for 5 - 10 minutes to allow the codes to be erased... unless yo uhave a code reader to erase them.

[mrl1214]

i have repalced all o2 sensors and MAS sensor, but still receive the 171 and 174 errors. Any ideas? Intake gasket also replaced due to a bulletin that was released regarding the torque on the manifold sometimes needing to be done.

[flip1daddy]

Change the fuel filter. Check the fuel pressure with a (fuel) pressure gauge at the schraeder valve on you fuel rail. If the pressure is good then look toward replacing the fuel injectors.

[flip1daddy]

Check this
http://www.justanswer.com/ford/1aigz...s-171-174.html

[way2old]

What year vehicle are we working on? Different model years have common failure points. Some have a PCV line that will suck a hole in it causing a lean condition.

[madmardigankbg]

Originally Posted by Andra

Can someone tell me how to fix this code? OBD II says code 171 running too lean bank 1 and code 174 running too lean bank 2. Is this a simple adjustment or do I need a diagnostic machine to adjust the air/fuel ratio? Would a tune up help?

Any advice is appreciated.

Here's a entertaining and funny video that could possibly fix your Po171 code Cheap! did for me on two separate occasions.

https://youtu.be/D3va0t8aUzY

[reekor]

It's always the noobies that dig up old and forgotten posts.