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 heater in one of the oxygen sensors on the second side of the engine. It's like a small heater isn't working right, which helps the sensor do its job.
The P0064 code indicates that the heater circuit for the third oxygen sensor on bank 2 is showing a higher than expected voltage, suggesting a possible fault in the heater circuit.
The heated oxygen sensor (HO2S) is used to measure the amount of oxygen in the exhaust gases. The heater helps the sensor reach its operating temperature quickly. Bank 2 refers to the side of the engine that does not contain cylinder 1. Sensor 3 is typically located further downstream in the exhaust system. A 'high' circuit condition means that the voltage is above the normal range expected by the engine control module (ECM).
• Check Engine Light is on
• Poor fuel economy
• Failed emissions test
• Faulty oxygen sensor heater
• Wiring issues such as open or short circuits
• Faulty engine control module (ECM)
HO2S: Heated Oxygen Sensor
ECM: Engine Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the resistance of the oxygen sensor heater circuit.
• Replace the faulty oxygen sensor.
• Repair or replace damaged wiring or connectors.
• Replace the engine control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Toyota Camry
• Ford F-150
• Chevrolet Silverado
• Regularly inspect and maintain the vehicle's exhaust system.
• Ensure the engine is properly tuned.
• Use high-quality fuel to prevent sensor contamination.
Sensor Issue
• Have the vehicle inspected by a professional mechanic.
• Avoid driving long distances until the issue is resolved.
Oxygen sensors may be covered under the vehicle's emissions warranty.
This code has been associated with vehicles that have high mileage or have not been maintained regularly.
Moderate – While the vehicle may still be drivable, it can lead to increased emissions and reduced fuel efficiency.
Driving with a faulty oxygen sensor can lead to higher emissions, which may not comply with local environmental regulations.
• Engine must be running.
• Sensor must be at operating temperature.
The oxygen sensor is located in the exhaust system, downstream on bank 2.
Q: Can I drive with a P0064 code?
A: You can drive short distances, but it's best to fix the issue soon to avoid further problems.
Q: How do I know which sensor is Bank 2 Sensor 3?
A: Refer to your vehicle's service manual to locate the specific sensor in the exhaust system.
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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.
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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.
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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.