Code P219A Bank 1 Air/fuel Ratio Imbalance

[PistolsFiring]

2022 Limited LT, 5.3, 21,2xx miles.

Started the truck up Sunday, drove for 2-3 minutes and check engine light comes on. Not a mechanic but no noticeable issues or changes in performance, noise, or driveability. Got to where I was going, turn truck off for a couple hours. Start back up, light still on, go to OReillys and they pull code P219A. Light stays on back and forth to work Monday. Start truck up Tuesday morning, light off and remained off since.

Few searches seems like it’s a generic code if the pre-cat sensors detect a lean or rich situation: ranges anywhere from bad fuel, vacuum leak, bad O2 sensor all the way to bad injector, bad fuel pump/filter, MAF sensor ect. I know any station can get a bad tanker of gas but fill up at the same station, 87 non ethanol. At the dealer today for them to take a look. Hopefully it stored permanent since light went off so they can atleast see it.

Anyone ran into this and since troubleshooting is broad, know what it typically points to as problem?

 

[clstark7]

2022 Limited LT, 5.3, 21,2xx miles.

Started the truck up Sunday, drove for 2-3 minutes and check engine light comes on. Not a mechanic but no noticeable issues or changes in performance, noise, or driveability. Got to where I was going, turn truck off for a couple hours. Start back up, light still on, go to OReillys and they pull code P219A. Light stays on back and forth to work Monday. Start truck up Tuesday morning, light off and remained off since.

Few searches seems like it’s a generic code if the pre-cat sensors detect a lean or rich situation: ranges anywhere from bad fuel, vacuum leak, bad O2 sensor all the way to bad injector, bad fuel pump/filter, MAF sensor ect. I know any station can get a bad tanker of gas but fill up at the same station, 87 non ethanol. At the dealer today for them to take a look. Hopefully it stored permanent since light went off so they can atleast see it.

Anyone ran into this and since troubleshooting is broad, know what it typically points to as problem?

Interesting. Did you use a different gas station than you normally use? Bad fuel would be my first guess. Did you check your air filter to make sure it looks clean? You might also check those PCV vacuum lines and make sure the air tubing to the throttle body is tight.

 

[clstark7]

Interesting. Did you use a different gas station than you normally use? Bad fuel would be my first guess. Did you check your air filter to make sure it looks clean? You might also check those PCV vacuum lines and make sure the air tubing to the throttle body is tight.

Never mind, I apparently need to finish reading your post lol. I have seen a good gas station here get a bad batch of gas once, it was watered down and it stranded multiple vehicles near that gas station. Have you heard anything like that, maybe?

 

[PistolsFiring]

Never mind, I apparently need to finish reading your post lol. I have seen a good gas station here get a bad batch of gas once, it was watered down and it stranded multiple vehicles near that gas station. Have you heard anything like that, maybe?

Not that I’ve heard at least. Only 3 gas stations in town, always used this one for years because of non ethanol option and never had an issue. Filled up 4 days prior to light, I did run it down pretty low (approx 50 miles left in indicator) so maybe pump pulled something off bottom of tank or a little air? Station did change hands, not sure exactly on timing, so maybe new source.

Air filter looks good, 55% left on indicator. O2 wires on exhaust look good from what I can tell, no corrosion.

 

[PistolsFiring]

Dealer said what I figured they would say. Code was stored so they documented it, did an inspection and documented could not replicate due to light being off and no other issues. Bring it back if it shows up again.

 

[PHXPHOTOG]

I could be wrong but I believe the air filter sensor runs on mileage not air flow. I replaced my filter with a K&N drop in filter. The sensor did not change. So I reset it manually. Easy to do but thats why I think it mileage based.

Steve

 

[PistolsFiring]

I could be wrong but I believe the air filter sensor runs on mileage not air flow. I replaced my filter with a K&N drop in filter. The sensor did not change. So I reset it manually. Easy to do but thats why I think it mileage based.

Steve

That makes sense. I bet you are right. I should have said I visually inspected the air filter (and blew it out with air hose) and it still looked good, as well as it’s at 55%. I probably do need to grab a K&N and go ahead and replace it though.

What gets me is if it is in fact fuel related you’d think I’d have other symptoms.? The light went off on the same tank of fuel.

 

[PHXPHOTOG]

That makes sense. I bet you are right. I should have said I visually inspected the air filter (and blew it out with air hose) and it still looked good, as well as it’s at 55%. I probably do need to grab a K&N and go ahead and replace it though.

What gets me is if it is in fact fuel related you’d think I’d have other symptoms.? The light went off on the same tank of fuel.

I doubt it is your air filter. These trucks are so laden with electronics they are full of bugs. Two months ago I was driving my 2021 with 25,000 miles on it and the DIC error came on and said new brake pads detected. Of course there was not new pads. Ten minutes later it went off. Next day I scrolled through the information page and it said I had zero wear left on the front pads and 87 percent on the rears. Dealer replaced a brake pad sensor to fix it.