The P0147 is a generic OBD-II powertrain trouble code. Its official definition is “O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 3)”.
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Before buying a used car, it’s essential to check for hidden issues. An OBD2 scanner allows you to read diagnostic trouble codes, detect engine or system faults, and make a more informed decision. Here are the best tools for pre-purchase inspection.
Why Use an OBD2 Scanner Before Buying a Car
Detect hidden issues
Avoid expensive repairs
Verify vehicle condition
What to Check with an OBD2 Scanner
Engine codes
Emissions readiness
System errors
FAQ
Q1: Can an OBD2 scanner detect all car problems?
No, but it reveals most electronic and engine-related issues.
Q2: Is it worth bringing an OBD2 scanner to inspect a car?
Yes, it can save you from buying a problematic vehicle.
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The P0143 is a generic OBD-II powertrain trouble code. Its official definition is “O2 Sensor Circuit Low Voltage (Bank 2, Sensor 3)”. This diagnostic trouble code is stored by the vehicle’s Engine Control Module (ECM) when it detects that the signal voltage from a specific oxygen sensor is persistently and abnormally low, typically near 0 volts.
The P0144 is a generic OBD-II powertrain trouble code. Its official definition is “O2 Sensor Circuit High Voltage (Bank 1, Sensor 3)”. This code is stored by the vehicle’s Engine Control Module (ECM) when it detects that the signal voltage from a specific oxygen sensor is persistently and abnormally high, typically near the reference or battery voltage level. The sensor designation is key: “Bank 1” refers to the side of the engine containing cylinder number 1. “Sensor 3” is not a standard upstream or primary downstream sensor; it is an additional sensor found in some vehicles, often a secondary downstream monitor.
The P0142 is a generic OBD-II powertrain trouble code. Its official definition is “O2 Sensor Circuit Low Voltage (Bank 1, Sensor 3)”. This code is stored by the vehicle’s Engine Control Module (ECM) or Powertrain Control Module (PCM) when it detects that the signal voltage from a specific oxygen sensor is persistently and abnormally low.
The P0118 is a generic OBD-II (Onboard Diagnostics II) trouble code. Its official definition is “Engine Coolant Temperature Sensor Circuit High Input”.
The B0084 is a generic OBD-II (Onboard Diagnostics II) trouble code. Its official definition is “Front Passenger Side Restraints Sensor (Single or Dual Stage Inflatable Restraint) Fault”.
The P0117 is a generic OBD-II (Onboard Diagnostics II) trouble code. Its official definition is “Engine Coolant Temperature (ECT) Sensor Circuit Low Input”.
Fault code P0115, applicable to all vehicle manufacturers, indicates “Engine Coolant Temperature (ECT) Sensor 1 Circuit Malfunction”.