P0147 Code - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 3

What Does P0147 Mean?

Modern vehicles use both an upstream and downstream oxygen sensor. The upstream oxygen sensor (O2S) is located ahead of the catalytic converter. It is used to determine the concentration of oxygen in the exhaust gas. This information is used by the PCM to control the engine air/fuel mixture. The sensor compares amount of oxygen in the exhaust to the surrounding air (there is an opening in the sensor that is exposed to the atmosphere). It generates a corresponding voltage which is transmitted to the PCM. The PCM then controls injector pulse based on this value.

The downstream oxygen sensor is located behind the catalytic converter and is used to check converter efficiency. It does so by checking the oxygen content of the exhaust after it leaves the converter. For this reason, downstream O2 sensors are known as catalyst monitors.

Modern vehicles use heated oxygen sensors (HO2S). These sensors contain a heating element that brings the sensor to operating temperature faster. This allows the PCM to use the signals input sooner, for more precise fuel control and reduced emissions. The heater circuit is energized through a relay that closes when the engine is cranked. The PCM monitors the heater circuit and will turn on the check engine light if it finds a problem.

Code P0147 stands for HO2S heater Performance Bank 1 Sensor 3. This indicates the PCM has detected a problem with heater circuit of the downstream oxygen sensor. Bank 1 refers to the side of the engine that has the #1 cylinder. Bank 2 is the opposite side of the engine. If you’ve got a four-cylinder, there will only be one bank. The related code for the other bank is P0167 HO2S Heater Performance Bank 2 Sensor 3. This indicates the PCM has detected a problem with the bank 2 downstream oxygen sensor heater.



Oxygen sensor diagram

engine code P0147	P0147 fix	obd P0147	dtc P0147
obd code P0147	obd2 P0147	P0147 car code	diagnostic code P0147
car code P0147	check engine code P0147	fehlercode P0147	P0147 fiat
codigo P0147	codigo falla P0147	P0147 kody b??dów	codigo de falla P0147

What are the common causes of P0147 ?

The ECM tests the O2 sensor heater circuits at startup for excessive current draw, opens, or shorts. In the case of the P0147 code, the ECM detects a short, open, or excessive current draw in the O2 bank 1 sensor 3 heater circuit.

What are the symptoms of P0147 ?

• Check Engine Light will illuminate
• In many cases, no abnormal symptoms may be noticed
• In some cases, the vehicle will fail an Emissions Test
• In many cases, the NOx emissions will be elevated

How do you troubleshoot P0147 ?

The valves of each cylinder are kept closed using a pair of arms that replace the conventional engine's roller-type rocker arm. P0147 code one of these arms follows the cam profile while the second arm connects to the valves. During normal engine operation the two arms are joined by a locking pin.



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