P2247: O2 Sensor Reference Voltage Circuit/Open (Bank 2 Sensor…

What P2247 means

P2247 is the bank 2 version of P2243: the Nernst-cell reference line of the upstream wide-band sensor on the second cylinder bank is open. Ford's summaries trip it on Bosch sensors after 10 s outside 0.2-4.7 V and on NTK sensors via the interface chip, replacing the older P0150. VW's 2014 Touareg book names it an open Nernst-voltage circuit with limits of 0.25 and 4.80 V, while GM's 2005 V6 tables call it Type B. Field cases include Honda bulletin 14-002 (2010-11 V6 models, broken sensor tip, usually with P0430), Jaguar Land Rover LTB00671 (2014-16 3.0 supercharged V6, water shock) and a 2025 Ram 1500 3.0 engine software update (FCA 18-071-26). P2243 is bank 1, P2249/P2250 the low/high faults, P2254 the open ground line on bank 2.

P2247 at a glance

Check engine lightYes, usually on
Emissions testCan fail
Limp modeNot expected
Repair difficultyMedium, DIY possible
Typical labor0.3 to 2 hours
Clears after repairWhen cleared with a scanner

Symptoms of P2247

Check engine light
Higher fuel consumption from open-loop fuelling on bank 2
Catalyst efficiency code P0430 if a sensor fragment damaged the converter

Common causes of P2247

Most likelyBroken reference voltage (Nernst cell) wire or loose pin on the bank 2 sensor
PossibleCracked element or broken sensor tip after thermal shock
Less likelyEngine software that sets the code falsely (update for some models)

Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.

Parts involved

Oxygen sensor bank2 sensor1Oxygen sensor wiringECM

What each part of P2247 means

P	Powertrain system: engine, fuel system, ignition, emissions and transmission.
2	Generic code (second SAE range): it means the same on every make.
2	Area: fuel and air metering (injector circuit).
47	The exact fault in that area.

What to do next

Note P2247 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.

Codes often seen with P2247

P2243 O2 Sensor Reference Voltage Circuit/Open (Bank 1 Sensor 1)
P2248 O2 Sensor Reference Voltage Performance (Bank 2 Sensor 1)
P2249 O2 Sensor Reference Voltage Circuit Low (Bank 2 Sensor 1)
P2250 O2 Sensor Reference Voltage Circuit High (Bank 2 Sensor 1)
P2240 O2 Sensor Positive Current Control Circuit/Open (Bank 2 Sensor 1)
P2254 O2 Sensor Negative Current Control Circuit/Open (Bank 2 Sensor 1)
P0150 O2 Sensor Circuit Bank 2 Sensor 1
P0430 Catalyst System Efficiency Below Threshold Bank 2

Questions about P2247

What does P2247 mean?

P2247 means "O2 Sensor Reference Voltage Circuit/Open (Bank 2 Sensor 1)". P2247 is the bank 2 version of P2243: the Nernst-cell reference line of the upstream wide-band sensor on the second cylinder bank is open. It is a generic code, so it means the same on every make.

Is it safe to drive with P2247?

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 P2247 fail an emissions test?

Yes, it can. P2247 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 P2247 to fix?

Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.

Will P2247 clear itself after the repair?

Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.

P2247 code meaning