P0064 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2, Sensor 3)

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0064 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0064 code

P0064 is a diagnostic trouble code (DTC) for "HO2S Heater Control Circuit High (Bank 2, Sensor 3)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0064 DIAGNOSTIC Get a fair and transparent estimate upfront

check engine light logo

P0064 trouble code definition

Indicates that there is an abnormally high voltage or resistance present in the heater control circuit of oxygen sensor (bank 2 sensor 3). The oxygen sensor measurements only become accurate when the sensor reaches a temperature of 600 degrees or above.

The power control module (PCM) sends a voltage to the heater circuit of the oxygen sensor. The sensor will then turn most of that voltage into heat, but will also use the voltage as a way to communicate the air-fuel ratio to the power control module.

The voltages and resistances being produced by the oxygen sensor must be within a certain specification or the power control module will try to adjust the air-fuel ratio. The high voltage or resistance output of oxygen sensor usually indicates that there is a rich air-fuel ratio being detected.

What the P0064 code means

It will usually mean that a rich air-fuel ratio is being detected. The computer of the vehicle (PCM) will then attempt to correct the air-fuel ratio by decreasing the amount of fuel the engine receives.

The PCM will regulate the air-fuel ratio and attempt to keep it at or near the stoichiometric range of 14.7:1. The stoichiometric range is ideal because it regulates the consumption of fuel, and limits the amount of harmful pollutants that an engine will produce.

What causes the P0064 code?

  • A bad oxygen sensor
  • Excessive soot or carbon buildup on the oxygen sensor, restricting it from measuring an accurate reading
  • Contaminated electrical connections or wiring
  • Shorted or open circuit conditions
  • A dirty or faulty mass airflow sensor

What are the symptoms of the P0064 code?

  • Loss of engine power and performance
  • A service engine light or Check Engine Light soon becoming displayed
  • A darker than normal exhaust smoke
  • A rich smell of gas from the exhaust

How does a mechanic diagnose the P0064 code?

  • Measuring the resistance output and voltage signal of the oxygen sensor by the use of a scan tool or multimeter, then comparing it to the manufacture specifications

  • Inspecting the base of the oxygen sensor for excessive soot or carbon buildup

  • By checking the electrical terminals and wiring for damage, corrosion, and other contaminants

Common mistakes when diagnosing the P0064 code

  • Replacing the wrong sensor by misinterpreting the order of the two to five oxygen sensors

  • Failing to clean or check the condition of the mass air flow sensor

How serious is the P0064 code?

  • It is very harmful to the environment because the engine won’t be able to accurately limit the amount of pollutants it creates.

  • Running a rich air-fuel ratio will shorten the lifespan of the catalytic convertor.

  • This code will shorten the life of engine components, such as the spark plugs.

What repairs can fix the P0064 code?

Additional comments for consideration regarding the P0064 code?

Check the condition of the spark plugs when diagnosing this trouble code. The condition of the spark plugs will help determine if the vehicle is in fact running rich. When a engine runs rich the spark plugs will likely have excessive soot and carbon build up or a strong fuel odor.

Need help with a P0064 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
trouble codes
P0064

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0064 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,203

Rating Summary
2,919
140
39
22
83
2,919
140
39
22
83

Nathan

26 years of experience
198 reviews
Nathan
26 years of experience
Nathan was knowledgeable about my car and very educational as well. He explained everything he was doing and why. I admire his attention to detail. He really showed genuine interest and attentiveness to the problem. He’s a great conversationalist and was easy to work with.
2013 CHEVROLET CRUZE - CHECK ENGINE LIGHT IS ON - GLENPOOL, OKLAHOMA

Mack

19 years of experience
72 reviews
Mack
19 years of experience
Very nice and knew what he was doing. Got what I needed done even though was told wrong by the office.
1999 FORD F-150 - CHECK ENGINE LIGHT IS ON - MIDLOTHIAN, TEXAS

Scott

31 years of experience
24 reviews
Scott
31 years of experience
Very nice friendly mechanic. Very helpful with with questions that I had. Offered good advice. He explained some of the problems to me and what should be the next to resolve it before spending unnecessary monies. This was my first time using him and will not be my last. I would recommend him to anyone. Especially women because he does not seem to take advantage of our knowledge of not knowing things about cars.
2001 HYUNDAI ELANTRA - CHECK ENGINE LIGHT IS ON - PARKVILLE, MARYLAND

Tyrone

6 years of experience
61 reviews
Tyrone
6 years of experience
He showed up on time and got my diagnostic done quickly. He also gave me honest recommendations on what I need to do for my car.
2008 HONDA ACCORD - CHECK ENGINE LIGHT IS ON - CULVER CITY, CALIFORNIA

More related articles

Symptoms of a Bad or Failing Timing Belt
Common signs include a ticking noise coming from the engine, an engine that won't turn over, engine misfires, and oil leaking in front of the motor.
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It...

Related questions

Q: How many spark plugs does my car have, so I can replace them.

Hello Your Audi Quattro should be equipped with a V6, meaning it has 6 cylinders in the V formation. You should replace all 6 spark plugs when changing them. If warning lights are coming on, you will want to have...

Q: Whilst driving the car will cut out. In the begining it would start immediatetly now if it cuts out it doesnt want to start

Hello. I would need to know the model of your Toyota to be able to give you the best information. From what you are telling me though it sounds like the crank sensor harness may be damaged or that one...

Q: engine malfunction

Although the check engine light, or warning light such as "engine malfunction", only came on intermittently, and is now off, your car's PCM would still store the diagnostic trouble codes that caused the light to illuminate. Those codes can be...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com