Powertrain, generic (extended)

P219B Bank 2 Air-Fuel Ratio Imbalance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P219B is the bank 2 counterpart for V and boxer engines. Ford's 2012 summary shows one way to find it: the ECM watches the fast ripple of the bank's wide-band sensor over windows of roughly 50 revolutions and sets the code when more than 75 % of them fail, after 300 to 700 s of driving at 1000 to 3000 rpm and 20 to 60 % load. On one GM 2016 engine the bank 2 limit is 1.15 against 1.05 for bank 1. Bulletins name leaking direct injectors (Ford F-150 2.7 EcoBoost 2018; Explorer and Aviator 3.0 EcoBoost 2023 to 2025, injectors of the affected bank replaced), faulty or contaminated injectors (Honda Pilot 2016), electrical noise in the A/F sensor lines (Mazda CX-9 2011 to 2013) and, at Infiniti on the QX80, a warning not to swap the A/F sensor first. A code on bank 2 only points to a part on that side.

Likely causes

Leaking or contaminated injector on bank 2
Interference or damage in the bank 2 A/F sensor wiring
Intake runner or gasket leak at one bank 2 cylinder
PCM calibration addressed by a software update

Symptoms

  • Check engine light on
  • Usually no driveability change
  • Possible misfire codes on bank 2 cylinders

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–2,000
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injectoroxygen sensor

Related codes

P219AP0300P2197P0174P0175

References: newtonnet.co.uk, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.