P2243 BMW Code - Upstream Oxygen Sensor Open Circuit Monitoring Reference Voltage Failure Bank 1
Quick Answer
The oxygen sensor circuit monitoring detects the following malfunctions by evaluating the error information received from oxygen sensor monitoring functions. Common causes include Faulty Upstream Oxygen Sensor Bank 1, Upstream Oxygen Sensor Bank 1 harness is open or shorted, Upstream Oxygen Sensor Bank 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P2243 BMW indicates Upstream Oxygen Sensor Open Circuit Monitoring Reference Voltage Failure Bank 1.
- Common causes
- Common causes include Faulty Upstream Oxygen Sensor Bank 1, Upstream Oxygen Sensor Bank 1 harness is open or shorted, Upstream Oxygen Sensor Bank 1 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P2243 BMW Description
This function shall be triggered only if one of the following diagnosis is active (to set the readiness bit), which are 'Upstream Oxygen Sensor - Signal Monitoring During Fuel Cut-off' and 'Upstream Oxygen Sensor - Heater Monitoring'. The function shall go to the state = “active” only if one of the above diagnosis detected a fault.
If a heater error exists and sensor voltage is too low, while the internal resistance measurement is turned off, an open circuit in the line 'Reference voltage' occurred.
What are the Possible Causes of the DTC P2243 BMW?
- Faulty Upstream Oxygen Sensor Bank 1
- Upstream Oxygen Sensor Bank 1 harness is open or shorted
- Upstream Oxygen Sensor Bank 1 circuit poor electrical connection
How to Fix the DTC P2243 BMW?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2243 BMW code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P2243 BMW Code
1. What does the OBDII code P2243 mean on a BMW?
P2243 indicates a fault in the upstream oxygen sensor circuit on Bank 1, specifically a failure in the monitoring reference voltage.
2. What are the symptoms of code P2243 on a BMW?
Common symptoms include a check engine light, poor fuel efficiency, rough idling, reduced engine performance, and possible difficulty starting the vehicle.
3. What causes the P2243 code in a BMW?
Possible causes include a faulty upstream oxygen sensor, damaged wiring or connectors in the sensor circuit, a blown fuse, or an issue with the engine control module (ECM).
4. Can I drive my BMW with the P2243 code?
Driving with this code is not recommended, as it may lead to higher emissions, poor engine performance, and potential damage to other components like the catalytic converter.
5. How is the P2243 code diagnosed on a BMW?
A technician will use a scan tool to confirm the code, inspect the oxygen sensor and wiring for damage, check for proper voltage supply, and test the ECM if needed.
6. How do I fix the P2243 code on my BMW?
Common repairs include replacing the upstream oxygen sensor, repairing or replacing damaged wiring or connectors, and checking the ECM for faults.
7. Is the P2243 code specific to BMW vehicles?
No, P2243 is a generic powertrain code, but its interpretation and repair procedures may vary slightly depending on the make and model.
8. How much does it cost to fix the P2243 code on a BMW?
Repair costs can range from $200 to $500 or more, depending on whether the oxygen sensor, wiring, or other components need replacement.
9. What tools are needed to repair the P2243 code?
Tools may include an OBDII scanner, a multimeter for voltage testing, and basic hand tools to replace the oxygen sensor or repair wiring.
10. Can a dirty air filter cause the P2243 code?
No, a dirty air filter is unlikely to cause this code, as it specifically relates to the upstream oxygen sensor circuit and reference voltage.
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