Engine Oil Change and P0420?

cannon1349 · 2020-01-03T17:22:55+00:00

Hi, I want to start a conversation about whether I should/shouldn't do certain services to this truck. I will be getting it in about 3 months, and it was a service truck, and mostly everything maintenance-wise was taken care of when it needed it. It runs good, trans shifts good, no problems and no leaks. However I have some concerns only because there was no record of the transmission being serviced nor the rear differential. This truck took 500 mile trips weekly, up until it reached 200,000 and then it was used every now and then between 1700 mile stretches. Do you think it would be okay to replace the fluid and filter in the trans, if the fluid isn't burnt? Also for the differential? What potential services would you consider for a truck this mileage but still runs good? Also, I see a recall maybe for the electronic power steering. If this went out, would there be any programming involved? I can replace a rack no problem.

2011 FORD F-150

317,000 MILES • 3.7L • V6 • 2WD • AUTOMATIC

ASEMASTER6371

✓ASE Certified Mechanic
52,796 POSTS

That is normal from the fluid being thrown around.

No issues there.

Roy

Mar 22, 2020 at 1:13 PM

CANNON1349

✓ASE Certified Mechanic
861 POSTS

Hey in reference to the P0420 above, can that occur due to an evap leak? I had that code and a gross leak evap code. I replaced the purge solenoid and both codes have disappeared, and engine light off but p0420 is now labeled as a historic fault if I scan the system.

Mar 25, 2020 at 9:48 AM

ASEMASTER6371

✓ASE Certified Mechanic
52,796 POSTS

No, there is no connection of the codes.

The 420 may be cleared but will come back. It has to fail its own internal test 3 times and light will come back.

Clearing codes does nothing as the issue needs to be addressed.

Roy

Mar 25, 2020 at 9:50 AM

CANNON1349

✓ASE Certified Mechanic
861 POSTS

I understand that, but I'm used to the p0420 coming back immediately.

Mar 25, 2020 at 9:52 AM

ASEMASTER6371

✓ASE Certified Mechanic
52,796 POSTS

It should not comeback right away. It is a 3 trip reset. When you clear it, all it does is make the ECM forget the code.

Roy

Mar 25, 2020 at 9:54 AM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.