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Trying to remove an o2 sensor that befor the cat off 200 caddy escalade

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To remove the O2 sensor you will need an O2 sensor socket that you can buy at most auto part stores, or you can dis-connect the wire connector for that O2 sensor, and then slip the wire connector from the O2 sensor through a 7/8 inch box end wrench and then slide the wrench up to the O2 sensor and then remove the O2 sensor. Use plenty of W-D40 to soak the base of the O2 sensor before removing it, and if the wire connector does not fit through the box end of the wrench then cut the wire connector off from the O2 sensor, and you will only need the open end of the wrench to install the O2 sensor, and only tighten the O2 sensor up until you feel the the sealing rings crush down, and do not over-tighten the O2 sensor because they are not supposed to be torqued down.

Posted on Sep 12, 2010

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3l, 6 cyl (California emissions). Where is the 4th O2 or (A/F) sensor?


HO2S( heated sensor) are before the cat convertor either in the manifold or exhaust pipe to the cat converter
O2 sensors are in the exhaust after the cat converter/s
I am drawing the difference because they are not all O2 sensors as each has a different operation for the position in the exhaust
the missing one will be in the exhaust manifold or pipe at a convenient position for servicing before the cat converter

Jan 09, 2016 | 2002 Toyota Camry

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How many o2 sensore are on the 99 bravado? I replaced the o2 sensor before the cat converter, now code says bank one( before cat.) needs replacing. are there 4?


the sensor before the cat is NOT an O2 sensor but a HO2S sensor ( two different sensors with different operations). If this is a V6 engine there are 4 sensors -- 2 --HO2S sensors before the cats --one for each bank cat and 2 O2 sensors after the cats.
The fault code would have spelt out the correct sensor for replacing

Jan 24, 2015 | 1999 Oldsmobile Bravada

1 Answer

O2 sensor?


O2 sensors are always after the cat converter and HO2S sensors are always before the cat converter.
p0135 refers to heated oxygen sensor(HO2S) 1 bank 1-heater control--circuit malfunction
If it is a straight 6 cylinder engine with 2 cat converters it will be the sensor before the cat converter that connects to the manifold from pistons 1.2.3
If it is a V6 it will be the sensor that is in front of the cat converter that connects to the rear bank pistons 1.2.3. Use the special socket when removing/replacing the sensors to prevent wiring damage

Apr 23, 2014 | 2004 Chevrolet Silverado 2500HD

1 Answer

Mitsubishi diamante 2003, changed two o2 sensors, still hesitates at start specially when warm


there should be 4 sensors in the system two are normal O2 sensors that are located after the cat converter and two are heated sensors HO2S sensors located before the cat converter. Use the special sensor removal/installer tool so that the wires are not damaged . If you only replace d 2 sensors then you may have missed the faulty unit. The check engine light will stay on until you reset it with a scanner

Apr 05, 2014 | 2003 Mitsubishi Diamante

1 Answer

Cadillac Escalade 2008 what to the codes P2270


Bank 1 Sensor 2 signal is indicating a lean condition, replace the O2 sensor. Right side (passenger) after the Cat.

Nov 02, 2013 | 2008 Cadillac Escalade

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What is cata system efficiency below threshold bank 1


Bank one cylinder catalytic is not performing in removing harmful emmissions

May 01, 2011 | 2005 Chevrolet Avalanche

1 Answer

Code reading p0420 on '99 chevy s10 blazer, low catalyst threshold. Is this a bad catalytic converter or burned valves?


there are a couple of things to consider here. That code indicates that the O2 sensor behind the cat is not functioning like the engine computer expects-either the cat itself is not functioning properly or you may have an exhaust leak, or the heater circuit in the O2 sensor is faulty. The cat should get up to 600 degrees and it burns unburned fuel before ti gets to the 2ed O2 sensor-if it cannot do this, the CEL comes on and you have a P0420. Before replacing the cat, clear the code and see if it comes back-if it does, you might try first replacing the O2 sensor. If that doesn't work, get a 'oil fouler' spark plug adapter and install the O2 sensor in it, then install both into the exhaust-this 'shields' the tip of the O2 sensor and slows it down, fooling the engine computer into seeing it switching slowly, as it is supposed to do. Your only other choice is to replace the cat, and an aftermarket cat is much less than an OEM unit.

By the way, if you have burnt valves, a P0420 is the least of your worries.

Apr 01, 2011 | 1999 Chevrolet Blazer

1 Answer

Trying to replace both oxygen sensors having a hard time gettin to them tryin to figure out the best and easiest way to get to and remove them and what tool would be best on a 2002 ford escort zx2


The "Before" CAT O2 sensor is easy, just remove the exhaust heat shield and you should have enough space to get to it. The "After" CAT O2 Sensor is a bit harder; I found the easiest way to do that is to remove the right wheel and it will expose an opening that you can reach through to break it loose.

Sep 17, 2010 | 2002 Ford Escort

2 Answers

Where is the O2 Sensor located on 2003 Ford Focus? Check Engine Light is on and trouble shooter device says the problem is in the O2 Sensor Heater Circuit, but where is it located.


The code will tell you which O2 sensor it is.
The code will point to either bank 1 sensor 1; bank 1 sensor 2; bank 2 sensor 1; bank 2 sensor 2.

From what I remember with a focus, it should only have 2 sensors, sensor 1 will be located before the cat, and sensor 2 will be located after the cat.

Oct 08, 2009 | 2003 Ford Focus

1 Answer

2002 Honda CR-V O2 sensor location


The O2 sensor is before the cat, the cat performance monitor (which looks like an O2 sensor) is after the cat.

Jul 29, 2008 | 2002 Honda CR-V

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