BRAND NEW *OEM QUALITY* OXYGEN SENSOR (LAMBDA SENSOR) TO SUIT FORD AU BA BF FG Falcon Barra SX SY SZ Territory BA9F472A
4 wire narrowband O2 Sensor with round plug.

PLEASE COMPARE YOUR ORIGINAL SENSOR WITH THE IMAGES WE PROVIDED IN THE LISTING AND CHECK THE DETAILED VEHICLE LIST IN THE SUITABILITY SECTION.

TO SUIT:

High-Quality sensor to suit AU, BA, BF, FG Falcon, Fairlane, XR6, XR8, Turbo, V8 & Territory SX, SY, SZ 6 Cylinder, Turbo, and many others. This sensor is a direct plug-in, no modifications are required to fit.

AU Falcon, Fairlane, XR6, XR8
BA BF Falcon, Fairlane, Barra XR6, XR6 Turbo, V8 3v, XR8 32v- same sensor pre and post cat
FG Falcon, XR6, XR6 Turbo, G6, G6E Turbo (pre Nov-2010) – same sensor pre and post cat
Territory SX, SY, SZ 6 Cylinder, Territory Turbo

Falcon AU UTE 1999-2002 (From 01/06/1999-On)
Falcon AU NU DU 1998-2002 (From 01/06/1999-On)
Falcon BA BF BFII BFIII 2002-2010 (From 01/07/2002-On)
Taurus DN 1996-1998
Territory SX SY SYII 2004-2011 (From 01/02/2004-On)

Explorer UT 2001-2005 (From 01/05/2001-On)
Falcon BA-BF-BFII-BFIII 2002-2010 (From 01/07/2002-On)
Falcon FG 2008-2011 (From 01/02/2008-On)
Falcon FG MKII 2011-2014 (From 10/10/2011 – 26/02/2013)
Territory SX-SY-SYII 2004-2011 (From 01/02/2004-On)
Territory SZ/SZ MKII 2011-On (From 01/02/2011 – 04/03/2013)

Falcon FG MKII 2011-2014
Falcon FG X & XR SPRINT 2014-
TERRITORY SZ/SZ MKII 2011-

OEM# BA9F472A, 5W6Z9G444BA, BE5Z9G444A

Features?

• High Quality
• OEM Fit and Design
• Easy install
• Simple operation
• AU Seller-Fast and Free Shipping

Package Includes:

2 PIECES * O2 Sensor, 4 wire narrowband O2 Sensor with round plug. suitable for both Pre-cat and Post-Cat

An Oxygen sensor is generally mounted in the exhaust stream of vehicles to measure the oxygen content of the exhaust gases. The sensor will compare the oxygen content to the oxygen proportion in the air and passes that information back to the vehicle’s Engine Control Module(ECU). to allow the adjustment of the air-fuel ratio so that a car’s engine can work at its optimal fuel efficiency level.

Designed to OE fit, form, and function
Ease of installation due to OE style connector
Extensive quality control at all levels of production

COMPATIBLE VEHICLES:

FORD 4.0 BARRA & IN-TECH ENGINES

[09/98 – 03/00] FORD FAIRLANE AU I 4.0L 6cyl Intech VCT
[04/00 – 06/03] FORD FAIRLANE AU II 4.0L 6cyl Intech VCT
[09/98 – 03/00] FORD FAIRMONT AU I 4.0L 6cyl Intech
[04/00 – 09/01] FORD FAIRMONT AU II 4.0L 6cyl Intech VCT
[10/01 – 09/02] FORD FAIRMONT AU III 4.0L 6cyl Intech VCT
[06/99 – 03/00] FORD FALCON AU I 4.0L 6cyl Intech E-Gas 143kW
[06/99 – 03/00] FORD FALCON AU I 4.0L 6cyl Intech
[09/98 – 03/00] FORD FALCON AU I 4.0L 6cyl Intech
[06/99 – 03/00] FORD FALCON AU I XR6 4.0L 6cyl Intech VCT
[09/98 – 03/00] FORD FALCON AU I XR6 4.0L 6cyl Intech VCT
[04/00 – 01/02] FORD FALCON AU II 4.0L 6cyl Intech E-Gas 143kW
[04/00 – 09/01] FORD FALCON AU II 4.0L 6cyl Intech E-Gas 143kW
[04/00 – 01/02] FORD FALCON AU II 4.0L 6cyl Intech
[04/00 – 09/01] FORD FALCON AU II 4.0L 6cyl Intech
[04/00 – 01/02] FORD FALCON AU II XR6 4.0L 6cyl Intech VCT
[04/00 – 09/01] FORD FALCON AU II XR6 4.0L 6cyl Intech VCT
[02/02 – 09/02] FORD FALCON AU III 4.0L 6cyl Intech E-Gas 143kW
[10/01 – 09/02] FORD FALCON AU III 4.0L 6cyl Intech E-Gas 143kW
[02/02 – 09/02] FORD FALCON AU III 4.0L 6cyl Intech
[10/01 – 09/02] FORD FALCON AU III 4.0L 6cyl Intech
[02/02 – 09/02] FORD FALCON AU III XR6 4.0L 6cyl Intech VCT
[10/01 – 09/02] FORD FALCON AU III XR6 4.0L 6cyl Intech VCT
[05/99 – 05/00] FORD LTD AU I 4.0L 6cyl Intech VCT
[06/00 – 06/03] FORD LTD AU II 4.0L 6cyl Intech VCT

[07/03 – 02/05] FORD FAIRLANE BA I 4.0L 6cyl Barra 182 182kW
[03/05 – 09/05] FORD FAIRLANE BA II 4.0L 6cyl Barra 182 182kW
[10/02 – 09/04] FORD FAIRMONT BA I 4.0L 6cyl Barra 182 182kW
[10/04 – 09/05] FORD FAIRMONT BA II 4.0L 6cyl Barra 182 182kW
[10/02 – 09/04] FORD FALCON BA I 4.0L 6cyl Barra 182 182kW
[10/02 – 09/04] FORD FALCON BA I 4.0L 6cyl Barra E-Gas 156kW
[10/02 – 09/04] FORD FALCON BA I XR6 4.0L 6cyl Barra 182 182kW
[10/02 – 09/04] FORD FALCON BA I XR6 4.0L 6cyl Barra 240 240kW
[10/04 – 09/05] FORD FALCON BA II 4.0L 6cyl Barra 182 182kW
[10/04 – 09/05] FORD FALCON BA II 4.0L 6cyl Barra E-Gas 156kW
[10/04 – 09/05] FORD FALCON BA II XR6 4.0L 6cyl Barra 182 182kW
[10/04 – 09/05] FORD FALCON BA II XR6 4.0L 6cyl Barra 240 240kW
[10/04 – 09/05] FPV F6 TORNADO BA II 4.0L 6cyl Barra 270 270kW
[10/04 – 09/05] FPV F6 TYPHOON BA II 4.0L 6cyl Barra 270 270kW

[10/05 – 12/07] FORD FAIRLANE BF 4.0L 6cyl Barra 190 190kW
[10/05 – 09/06] FORD FAIRMONT BF I 4.0L 6cyl Barra 190 190kW
[10/05 – 09/06] FORD FAIRMONT BF I 4.0L 6cyl Barra E-Gas 156kW
[10/06 – 06/09] FORD FAIRMONT BF II 4.0L 6cyl Barra 190 190kW
[10/06 – 04/08] FORD FAIRMONT BF II 4.0L 6cyl Barra 190 190kW
[10/06 – 04/08] FORD FAIRMONT BF II 4.0L 6cyl Barra E-Gas 156kW
[10/05 – 09/06] FORD FALCON BF I 4.0L 6cyl Barra 190 190kW
[10/05 – 09/06] FORD FALCON BF I 4.0L 6cyl Barra E-Gas 156kW
[10/05 – 09/06] FORD FALCON BF I XR6 4.0L 6cyl Barra 190 190kW
[10/05 – 09/06] FORD FALCON BF I XR6 4.0L 6cyl Barra 245 245kW
[10/05 – 09/06] FORD FALCON BF I XR6 4.0L 6cyl Barra E-Gas 156kW
[10/06 – 04/08] FORD FALCON BF II 4.0L 6cyl Barra 190 190kW
[10/06 – 04/08] FORD FALCON BF II 4.0L 6cyl Barra E-Gas 156kW
[10/06 – 04/08] FORD FALCON BF II XR6 4.0L 6cyl Barra 190 190kW
[10/06 – 04/08] FORD FALCON BF II XR6 4.0L 6cyl Barra 245 245kW
[10/06 – 04/08] FORD FALCON BF II XR6 4.0L 6cyl Barra E-Gas 156kW
[05/08 – 12/10] FORD FALCON BF III 4.0L 6cyl Barra 190 190kW
[05/08 – 07/11] FORD FALCON BF III 4.0L 6cyl Barra E-Gas 156kW
[10/05 – 09/06] FPV F6 TORNADO BF I 4.0L 6cyl Barra 270 270kW
[10/06 – 04/08] FPV F6 TORNADO BF II 4.0L 6cyl Barra 270 270kW
[10/05 – 09/06] FPV F6 TYPHOON BF I 4.0L 6cyl Barra 270 270kW
[10/06 – 04/08] FPV F6 TYPHOON BF II 4.0L 6cyl Barra 270 270kW
[10/06 – 04/08] FPV FORCE 6 BF II 4.0L 6cyl Barra 270 270kW

[05/08 – 04/10] FORD FALCON FG I 4.0L 6cyl Barra 195 195kW
[05/08 – 11/11] FORD FALCON FG I 4.0L 6cyl Barra 195 195kW
[05/08 – 11/11] FORD FALCON FG I 4.0L 6cyl Barra 270 270kW
[05/08 – 04/11] FORD FALCON FG I 4.0L 6cyl Barra E-Gas 156kW
[05/11 – 11/11] FORD FALCON FG I 4.0L 6cyl Barra ecoLPi 198kW
[05/08 – 04/10] FORD FALCON FG I XR6 4.0L 6cyl Barra 195 195kW
[05/08 – 11/11] FORD FALCON FG I XR6 4.0L 6cyl Barra 195 195kW
[05/08 – 11/11] FORD FALCON FG I XR6 4.0L 6cyl Barra 270 270kW
[05/08 – 04/11] FORD FALCON FG I XR6 4.0L 6cyl Barra E-Gas 156kW
[12/11 – 10/14] FORD FALCON FG II 4.0L 6cyl Barra 195 195kW
[12/11 – 10/14] FORD FALCON FG II 4.0L 6cyl Barra 270 270kW
[12/11 – 10/14] FORD FALCON FG II 4.0L 6cyl Barra ecoLPi 198kW
[12/11 – 10/14] FORD FALCON FG II XR6 4.0L 6cyl Barra 195 195kW
[12/11 – 10/14] FORD FALCON FG II XR6 4.0L 6cyl Barra 270 270kW
[12/11 – 10/14] FORD FALCON FG II XR6 4.0L 6cyl Barra ecoLPi 198kW
[11/14 – 10/16] FORD FALCON FG X 4.0L 6cyl Barra 195 195kW
[11/14 – 10/16] FORD FALCON FG X 4.0L 6cyl Barra 270 270kW
[11/14 – 10/16] FORD FALCON FG X 4.0L 6cyl Barra ecoLPi 198kW
[11/14 – 10/16] FORD FALCON FG X XR6 4.0L 6cyl Barra 195 195kW
[11/14 – 10/16] FORD FALCON FG X XR6 4.0L 6cyl Barra 270 270kW
[11/14 – 10/16] FORD FALCON FG X XR6 4.0L 6cyl Barra ecoLPi 198kW
[05/08 – 11/11] FPV F6, F6E FG I 4.0L 6cyl Barra 310 310kW
[12/11 – 12/14] FPV F6, F6E FG II 4.0L 6cyl Barra 310 310kW
[01/11 – 12/14] FPV F6, F6E FG II 4.0L 6cyl Barra 310 310kW
[02/08 – 12/09] FPV F6X FG I 4.0L 6cyl Barra 270 270kW

FORD TERRITORY 4.0 6CYL & 2.7 TURBO

[01/04 – 12/05] FORD TERRITORY SX 4.0L 6cyl Barra 182 182kW
[01/05 – 12/09] FORD TERRITORY SY 4.0L 6cyl Barra 190 190kW
[01/06 – 12/09] FORD TERRITORY SY 4.0L 6cyl Barra 245 245kW
[01/09 – 12/11] FORD TERRITORY SY II 4.0L 6cyl Barra 190 190kW
[01/09 – 12/11] FORD TERRITORY SY II 4.0L 6cyl Barra 245 245kW
[01/11 – 12/14] FORD TERRITORY SZ 4.0L 6cyl Barra 195 195kW
[01/14 – 12/16] FORD TERRITORY SZ II 4.0L 6cyl Barra 195 195kW

[01/14 – 12/16] FORD TERRITORY SZ II 2.7L V6 Duratorq 140kW

FORD 5.0 V8 WINDSOR ENGINE

[09/98 – 03/00] FORD FAIRLANE AU I 5.0L V8 302 cu.in Windsor
[04/00 – 06/03] FORD FAIRLANE AU II 5.0L V8 302 cu.in Windsor
[09/98 – 03/00] FORD FAIRMONT AU I 5.0L V8 302 cu.in Windsor
[04/00 – 09/01] FORD FAIRMONT AU II 5.0L V8 302 cu.in Windsor
[10/01 – 09/02] FORD FAIRMONT AU III 5.0L V8 302 cu.in Windsor
[06/99 – 03/00] FORD FALCON AU I 5.0L V8 302 cu.in Windsor
[09/98 – 03/00] FORD FALCON AU I 5.0L V8 302 cu.in Windsor
[06/99 – 03/00] FORD FALCON AU I XR8 5.0L V8 302 cu.in Windsor
[09/98 – 03/00] FORD FALCON AU I XR8 5.0L V8 302 cu.in Windsor
[04/00 – 01/02] FORD FALCON AU II 5.0L V8 302 cu.in Windsor
[04/00 – 09/01] FORD FALCON AU II 5.0L V8 302 cu.in Windsor
[04/00 – 01/02] FORD FALCON AU II XR8 5.0L V8 302 cu.in Windsor
[04/00 – 09/01] FORD FALCON AU II XR8 5.0L V8 302 cu.in Windsor
[02/02 – 09/02] FORD FALCON AU III 5.0L V8 302 cu.in Windsor
[10/01 – 09/02] FORD FALCON AU III 5.0L V8 302 cu.in Windsor
[02/02 – 09/02] FORD FALCON AU III XR8 5.0L V8 302 cu.in Windsor
[10/01 – 09/02] FORD FALCON AU III XR8 5.0L V8 302 cu.in Windsor
[02/02 – 09/02] FORD FALCON AU III XR8 5.6L V8 342 cu.in Windsor
[05/99 – 05/00] FORD LTD AU I 5.0L V8 302 cu.in Windsor
[06/00 – 06/03] FORD LTD AU II 5.0L V8 302 cu.in Windsor

FORD 5.4 V8 BOSS & BARRA ENGINES

[07/03 – 02/05] FORD FAIRLANE BA I 5.4L V8 Barra 220 220kW
[03/05 – 09/05] FORD FAIRLANE BA II 5.4L V8 Barra 220 220kW
[10/02 – 09/04] FORD FAIRMONT BA I 5.4L V8 Barra 220 220kW
[10/04 – 09/05] FORD FAIRMONT BA II 5.4L V8 Barra 220 220kW
[10/02 – 09/04] FORD FALCON BA I 5.4L V8 Barra 220 220kW
[10/02 – 09/04] FORD FALCON BA I XR8 5.4L V8 Boss 260 260kW
[10/04 – 09/05] FORD FALCON BA II 5.4L V8 Barra 220 220kW
[10/04 – 09/05] FORD FALCON BA II XR8 5.4L V8 Boss 260 260kW
[07/03 – 02/05] FORD LTD BA I 5.4L V8 Barra 220 220kW
[03/05 – 09/05] FORD LTD BA II 5.4L V8 Barra 220 220kW
[02/03 – 09/04] FPV GT BA I 5.4L V8 Boss 290 290kW
[10/04 – 09/05] FPV GT BA II 5.4L V8 Boss 290 290kW
[02/03 – 09/04] FPV GT-P BA I 5.4L V8 Boss 290 290kW
[10/04 – 09/05] FPV GT-P BA II 5.4L V8 Boss 290 290kW
[02/03 – 09/04] FPV PURSUIT, SUPER PURSUIT BA I 5.4L V8 Boss 290 290kW
[10/04 – 09/05] FPV PURSUIT, SUPER PURSUIT BA II 5.4L V8 Boss 290 290kW

[10/05 – 12/07] FORD FAIRLANE BF 5.4L V8 Barra 230 230kW
[10/05 – 09/06] FORD FAIRMONT BF I 5.4L V8 Barra 230 230kW
[10/06 – 04/08] FORD FAIRMONT BF II 5.4L V8 Barra 230 230kW
[10/05 – 09/06] FORD FALCON BF I 5.4L V8 Barra 220 220kW
[10/05 – 09/06] FORD FALCON BF I 5.4L V8 Barra 230 230kW
[10/05 – 09/06] FORD FALCON BF I XR8 5.4L V8 Boss 260 260kW
[10/06 – 04/08] FORD FALCON BF II 5.4L V8 Barra 220 220kW
[10/06 – 04/08] FORD FALCON BF II 5.4L V8 Barra 230 230kW
[10/06 – 04/08] FORD FALCON BF II XR8 5.4L V8 Boss 260 260kW
[10/05 – 12/07] FORD LTD BF II 5.4L V8 Barra 230 230kW
[10/06 – 04/08] FPV FORCE 8 BF II 5.4L V8 Boss 290 290kW
[10/06 – 04/08] FPV FORCE 8 BF II 5.4L V8 Boss 302 302kW
[10/05 – 09/06] FPV GT BF I 5.4L V8 Boss 290 290kW
[10/06 – 04/08] FPV GT BF II 5.4L V8 Boss 290 290kW
[10/06 – 04/08] FPV GT COBRA BF II 5.4L V8 Boss 302 302kW
[10/05 – 09/06] FPV GT-P BF I 5.4L V8 Boss 290 290kW
[10/06 – 04/08] FPV GT-P BF II 5.4L V8 Boss 290 290kW
[10/06 – 04/08] FPV GT-P BF II 5.4L V8 Boss 302 302kW
[10/05 – 09/06] FPV PURSUIT, SUPER PURSUIT BF I 5.4L V8 Boss 290 290kW
[10/06 – 04/08] FPV PURSUIT, SUPER PURSUIT BF II 5.4L V8 Boss 290 290kW
[10/06 – 04/08] FPV PURSUIT, SUPER PURSUIT BF II 5.4L V8 Boss 302 302kW
[10/06 – 04/08] FPV PURSUIT, SUPER PURSUIT BF II COBRA 5.4L V8 Boss 302 302kW

[05/08 – 11/11] FORD FALCON FG I XR8 5.4L V8 Boss 290 290kW
[05/08 – 11/11] FPV GS FG I 5.0L V8 Coyote 315 315kW
[05/08 – 11/11] FPV GS FG I 5.4L V8 Boss 302 302kW
[12/11 – 12/14] FPV GS FG II 5.0L V8 Coyote 315 315kW
[05/08 – 11/11] FPV GT FG I 5.0L V8 Coyote 335 335kW
[05/08 – 11/11] FPV GT FG I 5.4L V8 Boss 315 315kW
[12/11 – 12/14] FPV GT FG II 5.0L V8 Coyote 335 335kW
[12/11 – 12/14] FPV GT-E FG II 5.0L V8 Coyote 335 335kW
[05/08 – 11/11] FPV GT-P FG I 5.0L V8 Coyote 335 335kW
[12/11 – 12/14] FPV GT-P FG II 5.0L V8 Coyote 335 335kW
[05/08 – 11/11] FPV PURSUIT, SUPER PURSUIT FG I 5.4L V8 Boss 315 315kW
[12/11 – 12/14] FPV PURSUIT, SUPER PURSUIT FG II 5.0L V8 Coyote 315 315kW

FORD EXPLORER V8 4.6L & V6 4.0L

[01/01 – 12/02] FORD EXPLORER UT 4.6L V8 281 cu.in Modular
[01/03 – 12/03] FORD EXPLORER UX 4.6L V8 281 cu.in Modular
[01/03 – 12/05] FORD EXPLORER UZ 4.6L V8 281 cu.in Modular

[01/96 – 12/97] FORD EXPLORER UN 4.0L V6 245 cu.in Cologne 119kW
[01/97 – 12/98] FORD EXPLORER UP 4.0L V6 245 cu.in Cologne 119kW
[01/99 – 12/99] FORD EXPLORER UQ 4.0L V6 245 cu.in Cologne 119kW
[01/00 – 12/01] FORD EXPLORER US 4.0L V6 245 cu.in Cologne 119kW
[01/01 – 12/02] FORD EXPLORER UT 4.0L V6 245 cu.in Cologne 153kW
[01/03 – 12/03] FORD EXPLORER UX 4.0L V6 245 cu.in Cologne 153kW
[01/03 – 12/05] FORD EXPLORER UZ 4.0L V6 245 cu.in Cologne 153kW

FORD OLD TRANSIT VANS

[01/01 – 12/06] FORD TRANSIT VH-VJ 2.3L 4cyl E5FA E5FC 103kW
[01/02 – 12/04] FORD TRANSIT VH-VJ 2.3L 4cyl E5FA E5FC 103kW
[01/00 – 12/06] FORD TRANSIT VH-VJ 2.3L 4cyl E5FA E5FC 103kW

FORD 5.4L 5.8L V8 TRUCKS

[01/90 – 12/93] FORD F150 5.8L V8 351 cu.in Windsor
[01/01 – 12/06] FORD F250 5.4L V8 330 cu.in Triton 194kW
[01/01 – 12/03] FORD F250 5.4L V8 330 cu.in Triton 194kW
[01/01 – 12/03] FORD F350 5.8L V8 351 cu.in Windsor
[01/01 – 12/03] FORD F350 SUPER DUTY GEN1 5.4L V8 330 cu.in Triton

FORD DURATEC V6 ENGINES

[01/99 – 12/01] FORD COUGAR SW 2.5L V6 Duratec 125kW
[01/01 – 12/02] FORD COUGAR SX 2.5L V6 Duratec 125kW

[01/01 – 12/03] FORD ESCAPE BA 3.0L V6 Duratec AJ 150kW
[01/03 – 12/03] FORD ESCAPE ZA 3.0L V6 Duratec AJ 150kW
[01/04 – 12/06] FORD ESCAPE ZB 3.0L V6 Duratec AJ 152kW
[01/06 – 12/08] FORD ESCAPE ZC 3.0L V6 Duratec AJ 152kW

[01/03 – 12/05] FORD FIESTA WP 1.6L 4cyl Duratec FYJA FYJB 74kW
[01/04 – 12/05] FORD FIESTA WP 1.6L 4cyl Duratec FYJA FYJB 74kW
[01/06 – 12/08] FORD FIESTA WQ 1.6L 4cyl Duratec FYJA FYJB 74kW
[01/08 – 12/10] FORD FIESTA WS 1.4L 4cyl Duratec SPJA 71kW
[01/08 – 12/11] FORD FIESTA WS 1.4L 4cyl Duratec SPJA 71kW
[01/08 – 12/12] FORD FIESTA WS 1.6L 4cyl Duratec HXJA 88kW
[01/08 – 12/11] FORD FIESTA WS 1.6L 4cyl Duratec HXJA 88kW

[01/02 – 12/05] FORD FOCUS LR 1.8L 4cyl Zetec EYDE 85kW
[01/02 – 12/04] FORD FOCUS LR 2.0L 4cyl Zetec EDDB 96kW
[01/02 – 12/05] FORD FOCUS LR 2.0L 4cyl Zetec EDDB 96kW
[01/03 – 12/04] FORD FOCUS LR ST170 2.0L 4cyl ALDA 127kW

[01/99 – 12/00] FORD KA TA 1.3L 4cyl Endura E 43kW
[01/00 – 12/02] FORD KA TB 1.3L 4cyl Endura E 43kW

[01/96 – 12/98] FORD MONDEO HC 2.0L 4cyl Zetec ZH20 NGA 94kW
[01/98 – 12/99] FORD MONDEO HD 2.0L 4cyl Zetec ZH20 NGA 94kW
[01/00 – 12/00] FORD MONDEO HE ST24 2.5L V6 Duratec SEA 125kW
[01/96 – 12/98] FORD TAURUS DN/DP 3.0L V6 Duratec

ABOUT YOUR VEHICLE’S OXYGEN SENSOR

What does an Oxygen Sensor do?
The oxygen sensor is an electronic device used to measure the amount of oxygen in a gas or liquid. It is most commonly used to measure the concentration of oxygen in exhaust gasses, to allow the adjustment of the air-fuel ratio so that a car’s engine can work at its optimal fuel efficiency level.

Where is the Oxygen Sensor located?
Most newer vehicles have more than one sensor, on the exhaust pipe, close to the engine, and another close to the muffler and catalytic converter. Having two O2 sensors means that the vehicle has two readings provided to the engine computer so that the vehicle can fine-tune its performance.

What happens when the sensor is malfunctioning?
The only way to know for certain if your sensor is malfunctioning is by using a diagnostic code reader. There are some items that often point to this issue, such as:
Fuel usage increases without a change in driving habits
Reduction in car performance
Engine running rough which doesn’t improve after replacing spark plugs
Engine light on the dashboard notifying the driver of an issue found by the engine computer.

What are the common causes of failure?
Some of the reasons sensors fail include:
Fuel that is contaminated
Carbon deposits on the sensor from an engine that has started to burn oil
The sensor has reached its end of life

How to determine if the Oxygen Sensor is malfunctioning?
3 signs of a failing oxygen sensor:
1. Check Engine Light Is On
2. Increased exhaust emissions
3. Bad performance