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� Before starting this project please make sure you have the following tools: - Jack - Jack Stands - Flat Head Screw Driver - 7/8" Open end wrench - 10mm socket & wrench - 14mm socket & wrench - masking or electrical tape - ohmmeter - OBDII scan tool

-- hand tools utilized for repair. Also included in picture are the seat screws and screw covers..

Toyota Echo: How to change post

catalytic O2 Sensor

This guide shows how to change the oxygen sensor located behind/after the catalystic converter.

Category: Maintenance

Tags: Oxygen, Echo, toyota, 01

Added Nov 10, 08 by tdutzi

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How to change O2 sensor in Toyota echo This is my first attempt at posting a DIY. Hope it is helpful. This DIY will provide step by step instructions to change the Oxygen Sensor located in Bank1 Sensor 2. This oxygen sensor is located behind the catalytic converter. The reason I had to change the oxygen sensor is because my check engine light was triggered. I used an OBDII scanner to scan for error codes. The code I had was PO141 which shows that the sensor is faulty. The shop manual I have for the echo states that the resistance of the Oxygen Sensor should be tested with an Ohmeter to confirm that the sensor is indeed bad. If out of tolerance the sensor can be replaced. I ordered my sensor directly from Toyota. It ran $167 after taxes. Note: There is a number stamped onto the oxygen sensor that you will need when ordering. Below are the steps I followed to test and remove the oxygen sensor.

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Page 1 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

Pictures of reference material:

-- This is an overview of the oxygen sensor components from the shop manual

Page 2 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- This is the first page of troubleshooting from the shop manual

Page 3 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- This is the second page of troubleshooting from the shop manual

Page 4 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- This is the third page of troubleshooting from the shop manual

Page 5 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- This is page one from my multimeter manual in reference to the O2 Sensor

-- This is the second page from my multimeter manual in reference to the 02 sensor

1. Jack up car – this allows access to oxygen sensor - Place jack under front jack point - After jacking up the car, place jack stands under proper support areas - Vehicle lift and support information can be found in shop manual on page IN-9

Page 6 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- Here are the jack points from the Shop Manual -- Here are some pictures of the jack and stands under the car:

-- Jack under front jack point with block of wood to prevent maring and to give extra lift height.

Page 7 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- Jack stand under front passenger side jack point.

2. Remove Front Passenger Seat – This allows carpet to be pulled back for removal of Oxygen Sensor - Remove draw tray from below front passenger seat - Unclip sensor below front passenger seat

-- seat belt sensor still attached

Page 8 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- seat belt sensor detached - Put tape over flat head screw driver blade and use to pry rear covers off of seat

-- screwdriver with tape on it - Use screwdriver to carefully pry covers off rear seat screw covers

Page 9 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- screw covers still attached to rear of seat track

-- screw covers removed from seat track - Carefully remove seat from car,.

Page 10 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- seat removed from car and placed in another room

-- view of echo interior with passenger seat removed.

3. Remove center console and test oxygen sensor - remove screw from rear cup holder

Page 11 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- screw in rear of center console

-- screw once removed from center console

- pull up on center console – this gives access to oxygen sensor connector

-- center consol slightly lifted with carpet pulled back slightly

Page 12 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- center console pulled up with light shining on O2 sensor connector

-- close up view of O2 sensor connector – note how the o2 sensor’s wire goes below the carpet

- Unclip oxygen sensor from connection

Page 13 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- close up view of O2 sensor connector on echo with O2 sensor disconnected

- test with ohmmeter to verify sensor is bad

-- schematic from shop manual (PG SF-60) detailing how to test oxygen sensor

-- view of oxygen sensor terminals *Note picture was taken after oxygen sensor was removed from exhaust.

4. Remove oxygen sensor – if test with ohm meter shows the sensor is faulty - from passenger compartment push oxygen sensor lead wire down below carpet and out of access hole. There is a rubber grommet that is part of the oxygen sensor – push this out of the hole.

Page 14 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- pushing oxygen sensor connector down through carpet towards grommet

-- close up view of hole in floor pan with oxygen sensor and grommet removed.

- under car remove O2 sensor from exhaust pipe using 7/8" wrench - (I didn’t have a metric wrench that was big enough)

Page 15 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

� Do not press grommet through hole – connector needs to stay loose so that wire can rotate when screwing oxygen sensor into exhaust - from underside of car screw oxygen sensor into exhaust being careful not to overly twist the connector wires. - from inside of car press rubber grommet through hole so that it seals - from underside of automobile pull on rubber grommet to make sure it is partially through and completely seals the hole.

-- under car view after oxygen sensor was removed.

.

-- New oxygen sensor next to old oxygen sensor

5. Install new oxygen sensor - from inside of car feed oxygen sensor down through carpet through hole in floor pan

Page 16 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

-- under car view with new 02 sensor.

6. Reinstall center console - line up front two clips and press center console down

-- front clips that hold front of center console in place.

Page 17 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor

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--- tighten rear screw

7. Re-install front seat

8. Remove jack stands and lower and remove jack

9. USE OBDII tool to clear engine code

10. Drive car and verify that check engine light stays out.

Recent Comments (1 total):

karens - Nov 12, 2008 10:03 am

Great guide! Very thorough.

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Page 18 of 18Toyota Echo: How to change post catalytic O2 Sensor

5/12/2009http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor