B0305 Porsche 911 Type 996 Diagnostic Trouble Code

B0305 Porsche 911 Type 996 code definition:
B0305 is a kind of OBD-II Diagnostic B-Body Diagnostic Trouble Code for Porsche 911 Type 996.

B0305 Porsche 911 Type 996 is described as Oxygen Sensor Circuit No Activity Detected Bank 2 Sensor 1. This code appears when the PCM (powertrain control module, also known as ECM or engine control module in other brands) remains at or close the 0.450 set voltage point. Other serious codes may cause this code to pop up, and they may come with dangerous drivability issues that may expose you to safety risks and cause damage to the engine in the long run.

Symptoms

Symptoms of a B0305 Porsche 911 Type 996 diagnostic trouble code may include:
  • Rich or lean exhaust
  • Fuel pressure too low
  • Engine surge
  • Reduction in engine performance, especially at low RPM levels
Place of B0305 in engine

Possible Causes :

  • A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
  • Some aftermarket accessories and performance modifications
  • Faulty IMRC actuator relay (if equipped)

Common Misdiagnoses

  1. IC Circuit High Voltage Problem
  2. Control Module Throttle Actuator Position Performance Problem
  3. Air Conditioning (A/C) Clutch Feedback Circuit High Voltage Problem
  4. Cruise Vehicle Speed/Set Speed Difference Too High Problem
  5. PCM Stack Overrun Problem

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code B0305 Porsche 911 Type 996 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before B0305 Porsche 911 Type 996.

Fortunately, B0305 Porsche 911 Type 996 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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