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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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
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.
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.
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
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
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.
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.
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