Honda Pilot 2016 P219 b

[Bank1]

Hi everyone,
My wife s car is starting to act up when stopped at traffic lights and attempting to restart. The only code stored is a P219b air/fuel balance issue. Considering it is a relatively new car that is mostly untouched, I would doubt it is a vacuum leak. Might be a MAF, or o2 sensor issue. Rather than venturing into rabbit holes, I would be delighted if anyone could point me to an efficient sequence of testing that would pinpoint the issue. I have access to an autoenginuity scan tool. The only thing that I noticed is a lag Or no signal on the load of the bank2 o2 sensor for some time (Few minutes) then in sync with bank 1. As always, thanks for your insights!

[Bank1]

Here is what was stored:
Both banks in closed loop
STFT: both <-3%
LTFT: both -12.5%
MAP 17.1 inHg
Speed: 37 mph rpm 2359
MAF 7.23 lb/min

[Bank1]

just recorded sensors vs rpms. I seems as both MAF and MAP are following RPMs. The interesting part is that long term fuel trim do not change, stay at -17%/lean while the short term fuel trim goes up only to 0 max, even at 5000 rpm… Never goes positive/lean… How could the engine be loaded with excess fuel at all time? I would have imagined the trim to change if it was an injector leak with high rpm consuming the excess???

[Schrodinger’s Box]

Without using the “B” word, could you swap the O2 sensors to oposing banks and see if the trouble migrates and follows the sensor – cost nothing and might be a pathway to future investigation. You will need a dedicated socket to fit the O2 sensors, but these days you really have to ahve one anyway.

[Bank1]

Thanks for the suggestion #1928nash, we ended up pleading the case for a leaking injector at the dealership. Judging by the reaction of the service person to the autoenginuity charts, it must be a common issue with this car. Problem confirmed by their auto tech. We received a new set of injectors for free. Online forums describe similar issue but people are offer beyond the 60k warranty threshold… It is insane that Honda does not do a recall or free replacement to all when the problem comes up. This is definitely a design/parts issue.

[Author]

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