Low severity
P0043Low voltage in the heater circuit of the oxygen sensor (Bank 1, Sensor 3)
Part
Oxygen sensor
Part price
$75
At a workshop
$100
You save
$25
How to read code P0043
P
System
Powertrain (engine and transmission)
0
Code type
Generic code (SAE / OBD-II)
0
Subsystem
General system / auxiliary measurement
43
Fault number
Specific fault within the subsystem
Symptoms
- Persistent error code in the computer memory
- Slower transition of the sensor into closed loop operation
Possible causes
- Short to ground in the heater circuit
- Faulty oxygen sensor heater
- Weak engine or fuel system
Diagnostic steps
- 1Perform a voltage drop test on the power wires
- 2Check continuity of the circuit all the way to the engine computer
- 3Inspect the vehicle's fuel system components
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Frequently asked questions about P0043
What does code P0043 mean?
P0043: Low voltage in the heater circuit of the oxygen sensor (Bank 1, Sensor 3).
What are the symptoms of code P0043?
Persistent error code in the computer memory; Slower transition of the sensor into closed loop operation.
What causes code P0043?
Short to ground in the heater circuit; Faulty oxygen sensor heater; Weak engine or fuel system.
Can I drive with code P0043?
SAFE TO DRIVE – The fault does not immobilise the car, but diagnose it as soon as possible.
How much does it cost to fix code P0043?
The part (Oxygen sensor) costs about $75, and a mechanic’s labour about $25.
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