Direct-fit & Universal Oxygen Sensor Application List

Also known as O2 sensors, HEGO sensors, Lambda sensors

Model	Engine Code	Chassis	Years	Price  inc VAT and P&P = in stock
Mazda 323 1.5i				Direct-fit		Universal
323 1.5i 16v 87bhp	Z5		10/1998 to 5/2001			£ 24.95
323 1.5i 16v 89bhp	Z5	194444 or lower	8/1994 to 10/1998			£ 24.95
323 1.5i F 16v 75bhp	Z5	BA	8/1994 to 10/1998	£ 64.28		£ 24.95
323 1.5i F 16v 89bhp	Z5	BA	8/1995 to 9/1998	£ 64.28		£ 24.95

Pre-cat / Post-cat? What does that mean?

• There will be at least one sensor at the front of the vehicle, mounted into the exhaust pipe or manifold somewhere before the catalytic convertor.
  This is known as the front, pre-cat or upstream sensor.
  V-type engines (V6, V8 etc) will often have one pre-cat sensor for each bank of cylinders.
  
  
• There will then be another sensor positioned after the catalyst, known as the rear, post-cat or downstream sensor.
  Under normal circumstances, the rear sensor does not have any direct impact on the fuel mixture (and therefore the running and emissions of the engine) - it is there to offer a comparison value after the catalyst, allowing the car to monitor the performance of the cat.