Diesel F150 Forum banner
1 - 7 of 7 Posts

· Registered
Joined
·
55 Posts
Discussion Starter · #1 ·
Well it was a good run. 18650 miles to be exact. My check engine light came on tonight along with a message from my Ford app saying emission issues. Amount of oxygen out of spec see dealer. Everything seems ok. Though the DEF tank sounded empty when I tapped on it, gauge said 35% I added DEF fluid an the gauge only came up to 63%. Anyone else have an issue like this?
 

· Registered
Joined
·
100 Posts
To be clear, you seem to be asking if anyone has had one or both problems
1.) A CEL related to an O2 reading (?)
2.) DEF level that does not read full after filling the DEF tank.

I have never had a CEL. I have had a non-responsive DEF tank level. In my case, I was doing one of those long days where the vehicle had not stoppped/nor was shut off well for over 750 miles. My DEF tank was running low so I stopped and added urea but the level never came up. I shut the truck off, let it sit for about 30 seconds and restarted. Level never came up. I continued to drive for another two hours and the level continued to drop until I arrived at a pilot car construction zone. This time, I had shut the truck off for 10 minutes while waiting for the pilot car. When I restarted, the level came up to the level I expected.

I do not know the algorithms for how the DEF tank reads level, but extended key-off reset periods seem to be necessary if you refill.

In your case, I'm not all that concerned about your DEF level. but your NOx sensor sounds like it is unhappy. I'd have the dealer work on that one first (assumes this is covered under powertrain warranty)
..
 

· Registered
Joined
·
55 Posts
Discussion Starter · #3 ·
I’ve got an appointment set as I’m still in warranty. I’ve been super happy with this truck so far. I made the just from Ram after 30 years. The last Ram could not stay out of the service bay. For 18,000 miles this truck has been almost flawless. Had two No Start issues that only opening and re closing the driver’s door resolved. Now this. I just find it strange that this CEL showed up after an over the air computer update…
 

· Registered
Joined
·
55 Posts
Discussion Starter · #4 ·
Update, Dealership says the Bank 1 Nox sensor has an issue. I think they said the sensor’s heater has failed. Also the Coolant booster pump is throwing a non “functioning” code. Parts are on order. Guess I’ll see how good their Tec is in their service department…
 

· Registered
Joined
·
55 Posts
Discussion Starter · #5 ·
Dealer says truck is repaired and ready for pickup. Funny thing is with the CEL lamp lit I was getting almost 2 mpg better. It’s been running awesome. And my DEF gauge is showing 2/3 full and distance to empty over 10,000 miles. I almost didn’t get the Nox sensor replaced because it’s running so nice. I’ll post here how things go.
 
1 - 7 of 7 Posts
Top