Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with the oxygen sensor on one side of the engine. It thinks the sensor is not getting enough power to work properly.
The P2245 code indicates that the reference voltage to the oxygen sensor (Bank 1 Sensor 1) is lower than expected, which can affect the sensor's performance.
The oxygen sensor in question is responsible for measuring the amount of oxygen in the exhaust gases. The engine control module (ECM) uses this information to adjust the air-fuel mixture. The reference voltage is a baseline voltage supplied to the sensor, and if this voltage is too low, it can lead to incorrect readings and affect engine performance.
• Check Engine Light is on
• Poor fuel economy
• Rough idle
• Engine hesitation
• Faulty oxygen sensor
• Wiring issues such as a short or open circuit
• Bad connection at the sensor or ECM
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, second generation
Bank 1: The side of the engine with cylinder 1
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Check the reference voltage at the oxygen sensor.
• Test the oxygen sensor for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the oxygen sensor if faulty.
• Repair or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect and maintain the vehicle's wiring and connectors.
• Use high-quality fuel to prevent sensor contamination.
• Perform regular engine tune-ups.
Sensor Issue
• Do not ignore the Check Engine Light; address the issue promptly.
• Consult a professional mechanic if unsure about the repairs.
Oxygen sensors may be covered under the vehicle's emissions warranty.
This code has been associated with issues in vehicles with aging sensors or wiring problems.
Moderate – It's important to address this issue to maintain engine performance and fuel efficiency.
Ignoring this code may lead to increased emissions, which can be illegal in some areas.
• Engine at operating temperature
• Vehicle in closed-loop mode
The oxygen sensor is located on the exhaust manifold of Bank 1, typically on the side of the engine with cylinder 1.
Q: Can I drive my car with a P2245 code?
A: It's possible to drive, but it's not recommended as it can lead to poor fuel economy and increased emissions.
Q: How do I know if my oxygen sensor is bad?
A: Symptoms include a rough idle, poor fuel economy, and a persistent Check Engine Light.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
Fitment Required · Vehicle-fitment part
Relevant when the code or supporting diagnostics point toward upstream or downstream oxygen-sensor faults.
This code family often involves upstream or downstream oxygen-sensor diagnosis.
Verify exact sensor position and vehicle fitment before buying.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.