PO 171 &174 fault codes

Reply Subscribe

Thread Tools

Search this Thread

05-21-2018, 11:21 AM

Toby56

Junior Member

Thread Starter

Join Date: May 2018

Posts: 2

Likes: 0

Received 0 Likes on 0 Posts

PO 171 &174 fault codes

2001, Ford F150, 4.2L, getting PO 171 & 174 fault codes. Replaced Mass Air Sensor, still getting same fault codes.

I seem to recall a Tech Service Bulletin about Intake Leaks or perhaps I'm just dreaming...

Anyway, need help.

Reply Like

05-22-2018, 10:35 AM

glc

Senior Member

Join Date: Dec 2006

Location: Joplin MO

Posts: 43,205

Likes: 9

Received 763 Likes on 706 Posts

You have a vacuum leak somewhere.

Why did you replace the MAF?

Last edited by glc; 05-22-2018 at 10:37 AM.

Reply Like

05-22-2018, 10:55 AM

Toby56

Junior Member

Thread Starter

Join Date: May 2018

Posts: 2

Likes: 0

Received 0 Likes on 0 Posts

MAF Sensor

Replaced Mass Airflow Sensor because of PO 171 & 174, which basically indicates O2 sensor is detecting more air coming into engine, than what MAF is indicating. A shot in the dark...

Reply Like