If you have a vehicle with a P0053 error code, the onboard computer (ECM) is seeing a problem with an oxygen sensor.
The official definition is “Heated O2 Sensor (HO2S) Heater Resistance (Bank 1, Sensor 1).”
There are usually four oxygen sensors on a vehicle.
This means that there is a problem with the sensor which is bad or has a wiring issue.
The O2 sensors are located on the exhaust both before and after the catalytic converter.
Sensor 1 is the first O2 sensor before the catalytic converter, also called the upstream oxygen sensor.
Symptoms P0053 Code
- Engine Light On
- Failed Emissions Test
- Bad Gas Mileage
The most common symptoms of a P0053 code are the engine light comes on, and the vehicle gets bad gas mileage.
The car or truck will also fail an emissions test.
Often the vehicle will drive well, but the engine light will say on.
In some extreme cases, the vehicle can run rough and idle badly if the 02 sensor has completely failed.
Causes and Fixes P0053 OBDII Code
- Fix #1:Bad Upstream O2 Sensor
- Fix #2: Wiring
A bad sensor is the most common problem with a P0053 error code.
Bank 1 Sensor 1 will be the first sensor on the exhaust before the catalytic converter on the side of the engine with the number one spark plug.
For example, a Toyota Tacoma that has a V6 engine has the number one spark plug located on the passenger side of the vehicle.
So in this example, the sensor will be located on the passenger side of the truck on the exhaust before the catalytic converter.
Replacing the sensor will often clear the error.
Check all the wiring and connections going to the O2 sensor for any damaged.
A meter can be used to check for continuity and read the voltage at the sensor.
A car or truck with a P0053 OBDII error Code means that an O2 sensor is not working.
This can mean a bad sensor or a wiring issue such as an open wire of connection.
Replacing the sensor is the most common problem and usually clears the error.
Have you had a vehicle with a P0053 OBDII error code? Let us know your thoughts below.