The Audi A4 engine oxygen sensor is a crucial component for engine control, as its primary function is to monitor engine emissions and relay this information to the engine control unit (ECU). This enables the ECU to adjust the combustion efficiency of the engine based on changes in oxygen levels. If there is a malfunction with the oxygen sensor, it can have several effects on the engine:

Audi A4 engine oxygen sensor is not good what impact ?
1、Reduced fuel economy: A faulty oxygen sensor can prevent accurate adjustment of fuel supply and ignition timing by the ECU, resulting in decreased fuel efficiency.

Audi A4 engine oxygen sensor is not good what impact ?
2、Degraded engine performance: In of combustion efficiency due to an impaired oxygen sensor may lead to poor acceleration, insufficient power output, and other performance issues.

Audi A4 engine oxygen sensor is not good what impact ?
3、Increased emissions: An improperly functioning oxygen sensor can disrupt proper control of combustion efficiency by the ECU, potentially leading to higher emission levels of substances like CO and NOx.

Audi A4 engine oxygen sensor is not good what impact ?
4、Engine fault indicator illuminated: When an abnormal signal is detected by the ECU due to a failed oxygen sensor, it will trigger a fault code and illuminate the engine fault indicator light.

Audi A4 engine oxygen sensor is not good what impact ?
5、Engine stalling: If fuel supply and ignition timing are not properly regulated by a malfunctioning oxygen sensor, it may result in unexpected stalling of the engine.

0258003478 AUDI A4 Oxygen Sensor
OEM NO.: 0258003478 0258003518 0258003519
Lambda Oxygen Sensor for AUDI A4 A6 from 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Type: Heating Type
Linear: 4 wires
this 0258003478 Oxygen Sensor also fit for CABRIOLET and VW Polo Passat 1.6 1.8 car