G4 Lambda Sensor - 1.4-1.8

This heated lambda (oxygen) sensor monitors the oxygen content in the exhaust gases and feeds real-time data back to the engine control unit. The ECU then adjusts the air-fuel mixture to maintain efficient combustion, smooth running, and correct emissions.

The built-in heater element allows the sensor to reach operating temperature quickly after start-up, improving cold-start performance, fuel economy, and reducing emissions. A faulty lambda sensor can cause poor fuel consumption, hesitation, engine warning lights, and failed MOT emissions tests.

Technical Details

• Sensor type: Heated oxygen (lambda) sensor

• Number of pins: 4-pin

• Cable length: 620 mm

• Function: Closed-loop mixture control and emissions regulation

• Location: Exhaust system (position depends on model/engine)

Vehicle & Engine Fitment Summary

VW New Beetle

• 1.4 Petrol (75 PS) – 2001–2010

• 1.6 Petrol (100–102 PS) – 1999–2010

• 1.8 Petrol (150 PS) – 1999–2010

• 2.0 Petrol (115 PS) – 1998–2010
  (Hatchback & Convertible)

VW Bora

• 1.4 Petrol (75 PS) – 2000–2005

• 1.6 Petrol (100–102 PS) – 1998–2005

• 2.0 Petrol (115 PS) – 1998–2005
  (Saloon & Estate)

VW Golf Mk4

• 1.4 Petrol (75 PS) – 1997–2006

• 1.6 Petrol (100–102 PS) – 1997–2006

• 1.8 Petrol (150 PS) – 1997–2005
  (Hatchback & Estate)

VW Caddy Mk2

• 1.4 Petrol (60 PS)

VW Fox

• 1.6 Petrol (101 PS)

VW Lupo

• 1.0 Petrol (50 PS)

VW Polo

• 1.0 Petrol (50 PS)

• 1.4 Petrol (60 PS)

• 1.6 Petrol (100–101 PS)

Common Symptoms of a Faulty Lambda Sensor

• Increased fuel consumption

• Engine management warning light

• Rough idle or hesitation

• Poor emissions test results