Our certified mechanics come to you · 12-month, 12,000-mile warranty
P0052 is a diagnostic trouble code (DTC) for "HO2S Heater Control Circuit High (Bank 2 Sensor 1)". 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.
HO2S Heater Control Circuit High (Bank 2 Sensor 1)
This code is seen when the Engine Control Module (ECM) tries to control the heater control circuit for Bank 2 Sensor 1 and finds high voltage present. The heater is an integral part of sensor function that is used to heat the oxygen sensor to operating temperature until the vehicle warms up. Oxygen sensors must be at operating temperature to provide accurate readings to the ECM for air fuel ratio control. This code may be seen with P0051.
The ECM checks for proper signals from all of the vehicle's sensors multiple times a second. When high voltage is found in the heater control circuit, the ECM triggers a Check Engine Light on the dashboard. In some circumstances, the vehicle may exhibit lower than normal fuel economy and run poorly.
Hooks up a scan tool to the vehicle's OBD2 port to read live sensor data and check for any codes present
Uses the freeze frame data associated with every code to determine what conditions the vehicle was under when the code was set
Clears the code and performs a test drive with the scan tool hooked up to monitor sensor data and observe if the code returns
If the code returns, performs a visual inspection of all wiring and connectors in the circuit, to rule them out
Observes the oxygen sensor data stream to inspect sensor operation
If everything checks out this far, performs a manufacturer-specific test of the ECM (varies by make and model; no steps should be skipped.)
P0052 can be a simple code to diagnose when all diagnostic steps are followed in the proper order and all tests are performed. A professional level scan tool that shows live sensor data will be required to properly diagnose any faults present.
The most common symptom is only the Check Engine Light being observed by the driver. In the chance that poor fuel economy or rough engine running is noticed, care should be taken when driving to ensure safety until the code can be diagnosed and repaired.
Any quality mechanic will own a scan tool capable of reading live sensor data.
When the heater circuit is found to have failed for the oxygen sensor, the sensor must be replaced. The heater is internal to the sensor and is replaced as a single unit.
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.
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.
