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Can someone give a diagram location of up and downstream 02 sensors on 2003 ford expedition?

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The upstream O2 sensors are just off the engine exhaust manifolds, the downstream sensor is located aft of the catalytic converter, it is not called an O2 sensor it is referred to as the catalyst efficiency monitor.

Posted on May 04, 2017

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Posted on Jan 02, 2017

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Location of downstream o2 sensor 2001 diagram would be helpful Thank you


Year--make--model would be helpful?
Downstream 02 sensor is usually after the cat. The code number usually tells you which sensor, bank1--bank 2 and so on, where applicable.

Mar 05, 2017 | Cars & Trucks

1 Answer

2003 honda civic o2 how to replace And how do i fin out which once is it


Hi Jesus, Im AL the owner of Big As Auto Repair.

If you have a 4 cylinder engine then you will only have two 02 sensors 1/1 is upstream and 1/2 is downstream. Upstream is the one closet to the engine and downstream is the one farther away from the engine.

If you have a six OR eight cylinder engine you will have four 02 Sensors. 1/1 means Bank One Sensor One. 1/1 and Bank one means right bank and right bank means the side with the number 1 spark plug. SO, 1/1 means, "Right Bank" Upstream 02 sensor. 1/2 means, "Right Bank" Downstream 02 sensor.

2/1 means, "Left Bank" Upstream 02 sensor and 2/2 means, "Left Bank" Downstream 02 sensor. Hope this helps and please visit my auto-repair-website at: http://www.bigasautorepair.com/

Nov 26, 2015 | 2003 Honda Civic

1 Answer

O2 sensor wiring diagram 2005 ford expedition


http://www.bbbind.com/technical.html
Free wiring diagrams & TSB's-all makes and models. Your 4 O2 sensors are shown under System: engine, Subsystem: fuel controls.

Dec 23, 2013 | Ford Expedition Cars & Trucks

1 Answer

Where is the downstream oxygen sensor on a 2003 chevrolet tracker?


The downstream 02 sensor will always to be one after or in the catalytic converter. Follow the exhaust pipe until you find the converter and the next 02 sensor you find will be the downstream.

Oct 16, 2010 | 2003 Chevrolet Tracker

2 Answers

Exact location of downstream O2 sensor.


Downstream O2 sensor is after (downstream) the catalitic converter on the exhaust pipe. Upstream O2 sensor is after (downstream) the engine exhaust manifold - before (upstream) the catalitic converter. Upstream O2 sensor controls air-to-fuel ratio to yield a small excess oxygen. Downstream O2 sensor assesses the catalitic converter performance.

Sep 22, 2009 | 2003 Pontiac Vibe

1 Answer

2004 Expedition blower noise


the squirrel cage is probably loose on the blower motor shaft.

here's 2003, don't have 04.

SECTION 412-02: Heating and Ventilation 2003 Expedition/Navigator Workshop Manual
REMOVAL AND INSTALLATION Blower Motor Removal and Installation
  1. Remove the RH lower instrument panel insulator.
  1. Remove the RH scuff plate.
  1. Position the carpet aside.
  1. Remove the blower motor.
    1. Disconnect the electrical connector.
    1. Remove the screws.
    1. Remove the blower motor.

May 22, 2009 | 2003 Ford Expedition

2 Answers

O2 sensor location


DTC P0156 indicates the output voltage of the downstream Heated Oxygen Sensor (HO2S) is less than some calibratable functional window. The possible causes are:
  1. Pinched, shorted and/or corroded wiring and pins.
  2. Crossed sensor wires
  3. Exhaust leaks.
  4. Contaminated HO2S.
  5. Bad HO2S.
Since you didnt specify the engine size in your vehicle - please see the diagram below for the location of the sensor(s)

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Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Apr 16, 2009 | 1998 Ford Windstar

2 Answers

4 codes P0171,P0174,P2195,P2197


Hi
171 system too lean
174 system too lean
2195 - 02 ozygen sensor signal stuck lean Bank1 Sensor 1
2197- 02 ozygen sensor signal stuck lean Bank 2
Sensor 1
The 2 front 02 sensors are located on the front of
the exhaust manifold.
Should solve problem and increase gas mileage.

Apr 01, 2009 | 2003 Ford Expedition

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