P0064
Fix within 1-2 weeksYour engine's computer detected a high voltage in the heater circuit for the oxygen sensor located after the catalytic converter on Bank 2. This sensor helps monitor the exhaust and ensure proper emissions.
Code P0064 means your Bank 2 Sensor 3 oxygen sensor heater circuit has a high voltage issue. Common causes: Faulty O2 sensor (80%), wiring damage (15%). Drivability: Yes, safe to drive. Repair cost: $50-$200 DIY, $150-$500 professional.
Can I Drive With P0064?
Yes, safe to drive
No restrictions, but fix within 1-2 weeks to avoid long-term issues and poor fuel economy.
Stop driving immediately if: Flashing CEL, loud noises, burning smell, rotten egg smell, significant power loss
Symptoms of P0064
- 1Check Engine Light is on
- 2Reduced fuel economy
- 3Engine may run slightly rough or hesitate
- 4Vehicle may fail an emissions test
Common Causes of P0064
Parts most likely causing this code, ranked by probability
The heater element inside the oxygen sensor itself has failed, causing a high resistance or open circuit that the computer interprets as high voltage.
80% of P0064 cases are fixed by replacing this part
Damaged, corroded, or shorted wiring or a loose connection to the oxygen sensor's heater circuit can cause an incorrect voltage reading.
15% of P0064 cases are fixed by repairing wiring or connectors
A blown fuse in the circuit supplying power to the oxygen sensor heater can interrupt the circuit and trigger this code.
4% of P0064 cases are fixed by replacing a fuse
A faulty engine computer is a very rare cause, but it can incorrectly interpret sensor signals or fail to provide proper voltage to the heater circuit.
1% of P0064 cases are fixed by replacing the ECM/PCM
Check These First (Before Buying Parts)
- Check all fuses related to the engine and O2 sensors in your vehicle's fuse box.
- Visually inspect the wiring and connector for Bank 2 Sensor 3 for any obvious damage, corrosion, or loose connections.
How to Diagnose P0064
- 1Check for any blown fuses related to the O2 sensor heater circuit in your vehicle's fuse box.
- 2Visually inspect the wiring harness and connector for Bank 2 Sensor 3 for any signs of damage, fraying, or corrosion.
- 3Using a multimeter, test the resistance of the heater circuit within the O2 sensor itself (unplugged).
- 4With the sensor unplugged, check for proper voltage supply to the heater circuit wires coming from the vehicle's harness.
- 5If all checks pass, consider professional diagnosis for potential ECM/PCM issues, though this is highly unlikely.
P0064 on Popular Vehicles
Toyota Camry
2007-2024Bank 2 Sensor 3 on Camry models is often located after the catalytic converter on the bank that does not contain cylinder #1 (usually the rear bank on V6 engines). Access can be tight, requiring specific tools.
85% fixed by replacing the O2 sensor
Honda Accord
2003-2024Similar to Camry, the downstream O2 sensor on Bank 2 is a common failure point. Inspect the wiring carefully for rodent damage, which is sometimes seen on Honda models.
80% fixed by replacing the O2 sensor
Ford F-150
2004-2024On F-150s, Bank 2 Sensor 3 is the downstream sensor on the passenger side. These sensors are exposed to harsh conditions. Check the wiring harness for chafing against the frame or exhaust components.
75% fixed by replacing the O2 sensor
Frequently Asked Questions
What does P0064 mean?
P0064 indicates that the engine's computer has detected a high voltage condition in the heater control circuit for the oxygen sensor located after the catalytic converter on Bank 2. This sensor is crucial for monitoring exhaust gases and ensuring efficient emissions.
Can I drive with P0064?
Yes, you can drive safely with a P0064 code. The vehicle will likely run in a 'limp mode' or use default fuel maps, which means reduced fuel economy and increased emissions. Fix this within 1-2 weeks to prevent further issues.
Will P0064 clear itself?
No, P0064 will not clear itself. The underlying electrical fault or sensor failure needs to be repaired. Once the repair is complete, you can clear the code with a scan tool, or it will eventually clear after several drive cycles if the issue is resolved.
How do I fix P0064 myself?
Start by checking fuses and visually inspecting the wiring to the Bank 2 Sensor 3 oxygen sensor. If those are good, you will likely need to replace the oxygen sensor itself. You'll need an O2 sensor socket, a ratchet, and possibly a multimeter for testing.
How much does it cost to fix P0064?
A DIY fix for P0064 typically costs $50-$200 for a new oxygen sensor. If you take it to a professional shop, expect to pay $150-$500, which includes parts and labor.
P0064 keeps coming back - why?
If P0064 keeps returning, it often means the initial diagnosis missed something. Double-check for subtle wiring damage, corrosion in the connector, or ensure you used a quality replacement oxygen sensor. In rare cases, a faulty ECM/PCM could be the cause.
Will P0064 fail emissions/smog test?
Yes, a P0064 code will cause your vehicle to fail an emissions or smog test. The check engine light being on automatically fails the test, and the faulty O2 sensor heater means the emissions system is not functioning correctly.
What's the difference between P0064 and P0063?
P0064 indicates a 'high' voltage condition in the Bank 2 Sensor 3 heater circuit, meaning the computer sees too much voltage or an open circuit. P0063 indicates a 'low' voltage condition, meaning the computer sees too little voltage or a short to ground in the same circuit.
P0064 on Ford F-150?
On a Ford F-150, P0064 typically points to the downstream oxygen sensor on the passenger side (Bank 2). These sensors are exposed to road debris and heat, making them common failure points. Check the wiring harness carefully, as it can be prone to rubbing or damage.
Questions to Ask Your Mechanic
Did you test the resistance of the O2 sensor heater circuit and the voltage supply to the sensor?
Good answer: Yes, I measured the resistance of the heater element in the sensor and it was out of spec (or open). I also confirmed there was proper voltage getting to the connector from the vehicle's harness.
What did you find when you inspected the wiring harness for Bank 2 Sensor 3?
Good answer: I thoroughly checked the wiring from the sensor connector all the way back to the main harness for any signs of damage, corrosion, or loose pins, and everything looked good (or I found and repaired a specific issue).
Repair Cost Estimate
DIY Repair
Parts only
$50-$200
Shop Repair
Parts + labor
$150-$500
Save $100-$300 by doing it yourself
Difficulty
intermediate
Time
1-2 hours
Intermediate - requires basic electrical testing with a multimeter and specific tools like an O2 sensor socket, but is generally manageable for a DIYer.
Cost of Waiting
Ignoring P0064 means your engine is running less efficiently, burning more fuel, and increasing harmful emissions. Over time, this can lead to premature failure of your catalytic converter, which is a significantly more expensive repair ($800-$2,500). A $50-$200 O2 sensor fix now prevents a much larger bill later.
While You're In There...
If you're removing exhaust components to access the O2 sensor, replacing old gaskets prevents exhaust leaks and ensures a proper seal.
Applying anti-seize to the new O2 sensor threads makes future removal much easier and prevents the sensor from seizing in the exhaust pipe.
Tools You'll Need
- OBD-II scan tool
- Multimeter
- Oxygen sensor socket (7/8 inch or 22mm)
- Ratchet and extensions
- Wire brush (for cleaning threads)
- Anti-seize compound
P0064 is a common code related to a specific sensor. Most repairs are straightforward, and once fixed, your engine will run more efficiently and cleanly.
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Your Next Steps
Step 1: Check your vehicle's fuse box for any blown fuses related to the O2 sensor heater circuit. Replace any blown fuses.
Step 2: Visually inspect the wiring harness and connector for Bank 2 Sensor 3. Look for frayed wires, melted insulation, or corrosion. Repair any damage you find.
Step 3: If fuses and wiring are good, use a multimeter to test the resistance of the heater circuit on the O2 sensor itself. If it's open or out of specification, replace the Bank 2 Sensor 3 oxygen sensor.