P219B code meaning
Bank 2 Air-Fuel Ratio Imbalance
Powertrain system Generic code P21xx codes Check engine light
What P219B means
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.
P219B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor1 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P219B
- Check engine light on
- Usually no driveability change
- Possible misfire codes on bank 2 cylinders
Common causes of P219B
- Most likelyLeaking or contaminated injector on bank 2
- PossibleInterference or damage in the bank 2 A/F sensor wiring
- PossibleIntake runner or gasket leak at one bank 2 cylinder
- Less likelyPCM calibration addressed by a software update
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injectorOxygen sensor
What each part of P219B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 9B | The exact fault in that area. |
What to do next
- Note P219B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P219B
What does P219B mean?
P219B means "Bank 2 Air-Fuel Ratio Imbalance". P219B is the bank 2 counterpart for V and boxer engines. It is a generic code, so it means the same on every make.
Is it safe to drive with P219B?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P219B fail an emissions test?
Yes, it can. P219B is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P219B to fix?
Difficulty: medium. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P219B clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.