This 2001 Ford ExplorerSportTrac & V6~4.0L~SOHC engine has 3 OxygenSensors; they are also known as HEGO\HeatedExhaustGasOxygen, H02\HeatedOxygen, Lambda\NarrowBand Sensors; as located below.
Sensor11+Sensor21, pic below, are between Rght+LeftManifolds & Rght+LeftCatConvertors, respectively.
Sensor12, pic below, is mounted in between the two collective\common\downstream RearCatConvertors.
All these Sensors are operationally alike & materially similar, excepting the longer or shorter 4WireCables.
A Bosch 15719 with 24i00 0m610 Long Cable+Plug is good to replace any Ford 4WireNarrowBand Sensor.
Each has a FordStandardPlug+4WireCable with Blk+Gra wires for the signal & Wht+Wht wires for a heater.
Each Sensors Heater element varies 3~9ohms & is used to decrease warmup time for the Signal element.
The upstream Sensor signals to the PowerControlModule\PCM are for ClosedLoop Air~Fuel Ratio control.
The downstream Sensor signal to the PCM monitors the CatConvertors & ensures Emissions compliance.
The PCM monitors+analyzes signal amplitude+frequency for FuelInjector control & setting TroubleCodes.
The 0.10~0.90vDC signals alternate every few seconds, responding to varying Lean~Rich Air~Fuel ratios.
An OBD2 scanner can be used to view\graph related codes & signals; I use OBDLink# MX+ & EX modules.
OxSensors degrade+fail with time or use; replace every 12Yrs\100kMiles to maintain engine performance:
these also often fail when their Cabling\Harness has been installed too near Moving or HotExhaust parts.
Driving with a failed OxSensor can eventually cause a CatConvertor to get clogged & an expensive repair.
Sensor replacement is relatively simple. Presoaking Sensor threads at the pipe bungs with penetrating oil for a few hours can ease removal; a MapGas torch can heat & break free excessively crusty bung threads. Nimble fingers also helps to disconnect+reconnect the wiring: Sensor11's plug is on the Engines rightrear, Sensor21's plug is above the Transmissions left ShiftCable, Sensor12's plug is on the Transmissions right.
15i00 0m381 Long 4WireCable+Plug
FactoryOE Replacements:
* Ford xL3f-9f472-ba Original 2000
* Ford xL3z-9f472-ba Installed 2010
Compatible Replacements:
* Bosch 15719 Installed 2020 With
24i00 0m610 Long 4WireCable+Plug
* Bosch 13117
* Denso 234-4403
* Spectra os5041
* Walker 250-24701
* NTK 22524
11i00 0m279 Long 4WireCable+Plug
FactoryOE Replacements:
* Ford f85z-9g444-ab Original 2000
* Ford gu2z-9g444-a Installed 2010
Compatible Replacements:
* Bosch 15719 Installed 2020 With
24i00 0m610 Long 4WireCable+Plug
* Bosch 15716
* Denso 234-4071
* Spectra os5037
* Walker 250-24001
* NTK 22500
Links To Related Info
Thanks go to the brave souls who've preceded me in similar adventures & freely shared their experience:
- https://web.archive.org/web/20170701123657if_/http://www.partsgeek.com/mmparts/the_ultimate_guide_to_the_oxygen_sensor_for_dummies.html
- https://web.archive.org/web/20200907142452if_/http://secure.lambdapower.co.uk/TechNotes/Tech-1.asp
- https://web.archive.org/web/20200907135224if_/http://www.bosch.com/stories/40-years-of-bosch-lambda-sensor
- https://web.archive.org/web/20200907151720if_/https://www.freeasestudyguides.com/heated-oxygen-sensor.html
- https://web.archive.org/web/20200907151127if_/http://www.fuelinjectedford.com/page31.html
- https://web.archive.org/web/20130626102106if_/http://www.motorcraftservice.com/vdirs/diagnostics/pdf/obdsm109.pdf#page=24
- https://web.archive.org/web/20200822182035if_/http://troubleshootmyvehicle.com/ford/4.0L/testing-the-oxygen-sensors-1
- https://web.archive.org/web/20200822182408if_/http://troubleshootmyvehicle.com/ford/4.0L/testing-the-oxygen-sensors-2
- https://web.archive.org/web/20200822182457if_/http://troubleshootmyvehicle.com/ford/4.0L/testing-the-oxygen-sensors-3
- https://web.archive.org/web/20200910195723if_/https://www.ranger-forums.com/4-0l-ohv-sohc-v6-tech-33/how-many-o2-sensors-137557 OxygenSensor Locations
- https://www.ranger-forums.com/general-ford-ranger-discussion-15/downstream-o2-sensor-voltage-164365 OxygenSensor Diagnosis
- https://youtu.be/afio03Sv_MU?t=0 OxygenSensor12@RearTailPipe Diagnos
- https://youtu.be/QiA8uksEYHo?t=25 OxygenSensors Replace
- https://youtu.be/9QzD8_srbSM?t=1 OxygenSensors Replace
- https://youtu.be/7Rtw8jI9quA?t=40 OxygenSensor11@RghtManifold Replace
- https://youtu.be/3reiaSERIXY?t=162 OxygenSensor11@RghtManifold Replace
- https://youtu.be/BVUzDz6i_bw?t=24 OxygenSensor12@RearTailPipe Replace
- https://web.archive.org/web/20200907182450if_/https://www.explorerforum.com/forums/threads/how-to-install-new-upstream-o2-sensors.282979 OxygenSensor11+21@Rght+LeftManifolds Replace
- https://www.boschautoparts.com/en/auto/oxygen-sensors/premium-oxygen-sensors?partId=13117 OxygenSensor11+21@Rght+LeftManifold Bosch# 13117
- https://www.boschautoparts.com/en/auto/oxygen-sensors/premium-oxygen-sensors?partId=15716 OxygenSensor12@RearTailPipe Bosch# 15716
- https://web.archive.org/web/20201113152331if_/https://images.carid.com/walker/items/schemes/13-03880.jpg ExhaustSystem PartsList Walker
- https://www.google.ca/search?q=%2B%22walker+exhaust+50202%22&tbm=isch&ved=2ahUKEwi3vKPu6P_sAhVBUM0KHTvNA4kQ2-cCegQIABAA&oq=%2B%22walker+exhaust+50202%22&gs_lcp=CgNpbWcQA1DpxwFYu_gBYK79AWgBcAB4AIABtgKIAYMpkgEIMC4yNS4zLjGYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=_aOuX_fJFsGgtQa7mo_ICA CatConvertors UpStream.47StateCompliant Walker# 50202
- https://www.google.ca/search?q=DEC+FOR9T20432&tbm=isch&ved=2ahUKEwiCxont9v_sAhX5Ap0JHdkPAhEQ2-cCegQIABAA&oq=DEC+FOR9T20432&gs_lcp=CgNpbWcQA1D-4BdYp5EYYNSVGGgBcAB4A4AB3AKIAeUYkgEIMC4xOC4yLjGYAQCgAQGqAQtnd3Mtd2l6LWltZ7ABAMABAQ&sclient=img&ei=qLKuX4LSOfmF9PwP2Z-IiAE&bih=612&biw=1366 CatConvertors UpStream.50StateCompliant DEC# for9t20432
- https://www.google.ca/search?q=walker+exhaust+53500&tbm=isch&ved=2ahUKEwjzpceq6__sAhV0A50JHbwfBLAQ2-cCegQIABAA&oq=walker+exhaust+53500&gs_lcp=CgNpbWcQAzoECAAQGFCDwCRYiNMkYOrfJGgAcAB4AIABhgGIAckGkgEDMy41mAEAoAEBqgELZ3dzLXdpei1pbWfAAQE&sclient=img&ei=lKauX_OLKPSG9PwPvL-QgAs&bih=612&biw=1366 CatConvertors DnStream.47StateCompliant Walker# 53500
- https://www.google.ca/search?q=Bosal+079-4172&tbm=isch&ved=2ahUKEwjQlJq67v_sAhUQX80KHU9eCsIQ2-cCegQIABAA&oq=Bosal+079-4172&gs_lcp=CgNpbWcQA1CDGVjNJWCLKmgAcAB4AIABqgGIAfIFkgEDMC42mAEAoAEBqgELZ3dzLXdpei1pbWfAAQE&sclient=img&ei=2qmuX9C_L5C-tQbPvKmQDA&bih=612&biw=1366 CatConvertors DnStream.47StateCompliant Bosal# 719-4172
- https://www.google.ca/search?q=DEC+FOR920586&tbm=isch&ved=2ahUKEwjwvc2r-P_sAhUJBs0KHUvgBqkQ2-cCegQIABAA&oq=DEC+FOR920586&gs_lcp=CgNpbWcQAzoCCAA6BQgAELEDOgQIABBDOggIABCxAxCDAVD0nhZYiLQWYPbAFmgAcAB4AIABmAGIAf8KkgEEMC4xMZgBAKABAaoBC2d3cy13aXotaW1nwAEB&sclient=img&ei=OLSuX_DBH4mMtAbLwJvICg&bih=612&biw=1366 CatConvertors DnStream.50StateCompliant DEC# for920586
- https://www.therangerstation.com/forums/index.php?threads/diagnosis-of-a-clogged-catalytic-converter.188268 CatConvertors Clog