P2244 — O2 Sensor Reference Voltage Performance Bank 1 Sensor 1

What is the most common cause of P2244?

The most common causes are: damaged sensor wiring or connector, oil or coolant contamination of the sensor tip, exhaust leak near the sensor.

What are the symptoms of P2244?

Drivers most often notice: failed emissions test, sluggish throttle response, Check Engine Light on, rough idle.

What does OBD2 code P2244 mean?

P2244 — O2 Sensor Reference Voltage Performance Bank 1 Sensor 1. A fault in the oxygen sensor circuit. The car is usually drivable while you plan the repair. Typical causes: damaged sensor wiring or connector, oil or coolant contamination of the sensor tip, exhaust leak near the sensor.

How much does it cost to fix P2244?

Replace the oxygen sensor — $150–$450; Fix an exhaust leak near the sensor — $100–$300; Repair sensor wiring — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

Will P2244 clear itself?

Sometimes P2244 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does P2244 mean?

When P2244 appears on a scan, it means the control module has flagged a problem in the oxygen sensor circuit: O2 sensor reference voltage performance bank 1 sensor 1. The fault sits in the powertrain (engine/transmission) group of the OBD2 standard.

In this definition, “Bank 1” is the side of the engine that contains cylinder 1 and “Sensor 1” is the upstream (before the catalytic converter) sensor. Mixing up banks and sensor positions is the most common DIY mistake with this code — verify the physical location before replacing anything.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2244 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

Common symptoms of P2244

• failed emissions test
• sluggish throttle response
• Check Engine Light on
• rough idle
• increased fuel consumption

What causes P2244?

• ECM signal circuit fault
• damaged sensor wiring or connector
• blown sensor heater fuse
• aged or contaminated oxygen sensor
• oil or coolant contamination of the sensor tip
• exhaust leak near the sensor

How to diagnose P2244

1. Connect an OBD2 scanner, confirm P2244 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
3. Visually inspect the wiring harness and connectors related to the oxygen sensor circuit for damage, corrosion, chafing or poor contact.
4. Watch the sensor voltage in live data: a healthy upstream sensor switches rapidly between roughly 0.1 and 0.9 V.
5. Measure heater resistance on the sensor connector and check the heater fuse and relay.
6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2244 does not return.

How to fix P2244

Start with the cheapest and most common causes before replacing expensive parts:

• Replace the oxygen sensor — $150–$450
• Fix an exhaust leak near the sensor — $100–$300
• Repair sensor wiring — $80–$250

How much does it cost to fix P2244?

Repair cost depends on which component actually failed. Typical scenarios for P2244 (parts and labor, USD, independent shop rates):

• Replace the oxygen sensor: $150–$450
• Fix an exhaust leak near the sensor: $100–$300
• Repair sensor wiring: $80–$250

Overall, fixing P2244 usually costs between $80 and $450. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2244?

You can usually drive for a while: the engine runs on a default fuel strategy, which costs you fuel and emissions. Fix it soon — prolonged driving with a bad O2 sensor can overheat and damage the catalytic converter.

Related OBD2 codes

• P2200: NOx Sensor Circuit Bank 1
• P2201: NOx Sensor Circuit Range/Performance Bank 1
• P2202: NOx Sensor Circuit Low Bank 1
• P2203: NOx Sensor Circuit High Bank 1
• P2204: NOx Sensor Circuit Intermittent Bank 1
• P2205: NOx Sensor Heater Control Circuit/Open Bank 1