P219A Code

[JAMADOR]

Car has intermittently thrown a P219A: Aif-Fuel Ratio Imbalance

Any quick checks fixes common this one to look into?

No performance effect that I can tell. Only possible symptom is it's averaging around 27mpg, but I've been having fun with it too, so that likely contributes to the lower MPG.

 

[JAMADOR]

Seems to have resolved itself? Haven't scanned codes, but the CEL is off now after about 100 miles on a fresh tank of gas [Shell 87]
Last tank was Costco 87

 

[Grsemky]

Try using premium gas.... I personally only put 91 in it, I live in AZ and get that California 91... My MPG averages 30.1 combined

 

[Sprinkle_Star]

Try a water remover fuel additive since condensation is more prevalent in the mornings this time of year.

 

[JAMADOR]

Thanks, if it returns, I'll try a few tanks of 93

 

[JAMADOR]

So, a maybe symptom.
CEL returns on a full tank & seems to go away when it gets down to around 3/4 full.
Will verify over the next tank or two to see if that's consistent.

 

[Sam4]

Is it a corn-related thing? Are you using high alcohol/low octane fuel? The 3/4's makes me think of the evap system and hose - I literally only put in 10 gallons anymore.

 

[JAMADOR]

Not sure on the ethanol part.
Last 2 tanks have been Shell 87 from the same station. Would have to look, but think the 2 before that were Costco 87.
If the next tank does the same CEL from full to 3/4, I'll try a tank or 2 of 93 and see if that has any different effect.

 

[Zeille]

Change o2 sensors? I had a p219a issue and replaced upstream & downstream and it went away. It was just an underlying code and never actually threw the light, but just a suggestion

 

[JAMADOR]

O2 sensor(s) or evap were my leading 2 guesses.
Evap more because it seems to be consistent with a full fuel fill.

 

[rallytaff]

Have never used anything except 91 in my 2014. No issues at all!