98 Ford,v8 4.6,F150 P0121 and P0174

dm910 · **Joined:** Tue Oct 31, 2006 5:36 pm **Posts:** 6

Lets try this again

I have a P0121 and P0174, any help !!!

I have a KN air filter and I am going to clean the mass air flow sensor as suggested on this forum

Sponsored Links · **Joined:** 29 Jun 2004 08:12 pm **Posts:** N/A

CarGuy · **Joined:** Sun Oct 15, 2006 11:36 am **Posts:** 22

P0121 is for the Throttle Position sensor and the P0174 is for System to lean bank 2. both codes are probably from the oil from the K&N filter. I would remove the K&N filter before it kills your MAF and TPS, reset check engine light and see if it returns.

dm910 · **Joined:** Tue Oct 31, 2006 5:36 pm **Posts:** 6

I have had the KN on for over 100k miles, today I cleaned the Mass Air Flow sensor, I failure would came back in a few weeks, so lets see if cleaning the MAF sensor helps, I will repost when I have a fix,

please continue to supply input, am I on the right track ??

Thanks Doug

B. Cash · **Posted:** Wed Nov 01, 2006 10:08 pm

Try cleaning the MAF and throw away the K&N. K&N= MAF worst enemy.

dm910 · **Joined:** Tue Oct 31, 2006 5:36 pm **Posts:** 6

so far so GOOD, no codes have come back, cleaned the mass air flow sensor, Truck is running real strong, no pinging, no codes

B. Cash · **Posted:** Thu Nov 09, 2006 9:37 pm

Hope you get many more trouble free miles out of the truck.

dm910 · **Joined:** Tue Oct 31, 2006 5:36 pm **Posts:** 6

500 plus miles, It runs great now as well, before I had a little pinging under a load around 3000 rpms, ON more pinging

B. Cash · **Posted:** Mon Dec 11, 2006 9:13 pm

Happy to hear everything is ok so far. Let us know if you need help with anything else.

98 Ford,v8 4.6,F150 P0121 and P0174

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