Question about Cadillac Seville

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2004 Cadillac Seville bank 1 O2 sensor near fire wall is froze in place in the exhaust manifold and will not back out even with extreme pressure. Will heating area near threads and expand exhaust free the sensor??

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Heating may help but it could be dangerous due to limited space. What you might try is start engine get mamifold hot. Shut off engine and use WD-40 and let it soak in, brake fluid also works like WD-40 but make sure the manifold is not so hot that it will burst into flame. Another way is to remove the two front bolts from the endine cradle and let the engine assembly down. this will give you more room. cut wires off get a 6 sided deep socket. If that fails use a air hammer to knock it loose. Hope this helps.

Posted on Aug 31, 2010

Testimonial: "Good balance between brute force and alternative methods, such as WD40."


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I have a 2004 ford explorer xlt v6 4.0l gas. need a o2 sensor diagram. I need names and description. for example bank 1 sensor 2 after catalytic converter

Hope this helps

Bank two are the even cylinders. Follow exhaust manifold on the side. You will find an O2 sensor just after or on the manifold, before the catalytic converter. Then, look after the catalytic and you should find another O2 sensor, this is the one you mention in your post.

Nov 30, 2016 | 2004 Ford Explorer XLT

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I had diagnostics run on my 2004 Jeep Grand Cherokee today and was told it's my O2 sensor, already figured that! It's Bank 1 Sensor 2- is that cylinder 4 5 and 6, post catalytic converter?

bank 1 is the right hand bank looking at the rngine from the front on a convention car or the bank closest to the fire wall on an east west set up
o2 sensors are always after the cat converter
HO2S or heated oxygen sensor which are different to O2 sensors are always in the exhaust manifold or pipe before the cat converter

Jun 24, 2016 | Jeep Cars & Trucks

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There are 2 upstream o2 sensors on cadillac sls and 2 downstream. There are 2 exhaust manifolds on the 8 cyl 4.6 L bank 1 sensor 1 which is backside manifold and bank 1 sensor 2 which is front manifol

the back manifold ( closest to the fire wall) is bank l
there are not 2 x O2 sensors up stream
they are heated oxygen sensors (HO2S) and are in the manifold or exhaust pipe before the cat converter
The 2 x O2 sensors are after the cat converter in the exhaust pipe
so bank 1 sensor 1 is a HO2S sensor
there is a difference in the sensors as the HO2S report exhaust gas conditions to the ECM for fuel /air adjustments , have 4 wires and are heated to read the gas correctly
the after cat converter sensors ar O2 sensors and report on the cat converter action to further adjust the air /fuel mix in the ECM

Mar 17, 2016 | Cadillac Cars & Trucks

1 Answer

There are 2 exhaust manifolds on cadillac 4.6 l bank 1 sensor 1 is in rear of engine on exhaust manifold and bank 1 sensor 2 is in front of engine exhaust manifold just before the cat. No room to work

So what do you want to know ? How to get in an replace O2 sensor ? That's what being a mechanic is all about ! Getting it done when other people can't .

Mar 17, 2016 | Cadillac Cars & Trucks

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Anyone have a diagram of a 2004 Toyota Tacoma Prerunner 3.4L 2wd o2 sensor UPSTREAM Bank 1 sensor 1 ??

It should be easy to find. It is between the exhaust manifold and the converter.

Mar 13, 2015 | Toyota Cars & Trucks

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Check Engine light with Po131 o2 circuit low voltage sensor 1 bank 1 reading, what does that mean?

- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Front Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

Replacing the O2 Sensor 1 usually takes care of the problem

The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

Feb 07, 2012 | 2004 Honda Odyssey

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Hello, I have a 2000 Mitsubishi Eclipse GT V6 3.0 that the service engine light soon has come on. A mechanic put his diagonistics machine on it and the error code P0135 - Heater circuit, bank 1 sensor 1. I...

it is not an O2 sensor but a heated oxygen sensor that is in the exhaust manifold before the cat converter
heated oxygen sensor(HO2S) 1 bank 1 is the one against the fire wall
it is not a heater as such but has an internal heating system so that it reads the exhaust emissions correctly and adjusts the air /fuel settings in the ECM
normally has 4 wires
the oxygen sensor (O2S) is after the cat converters and is a completely different sensor to read a different exhaust gas

Apr 12, 2017 | Mitsubishi Eclipse Cars & Trucks

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Engine has severe miss @ idle under load. Runs fine when driving. Plug and Plug Wires are Ok. Put on a Scanner and got code Po135.

The DTC (Data Trouble Code) P0135 is for the O2 sensor Heater Circuit Bank 1 Sensor 1. Bank 1 will always be the cylinder bank with the number one cylinder and spark plug, and the number one O2 sensor will be located before the catalytic converter and usually at the rear of the exhaust manifold or just after it. According to the firing order diagram bank one is the cylinder bank that is closest to the fire-wall and there should be an O2 sensor located there around the rear of the exhaust manifold or just after it. If the engine is a 4 cylinder then it will be the O2 sensor before or up-stream of the catalytic converter. Check for any damaged wiring or loose wire connector at the O2 sensor and if they are alright then replace the O2 sensor and then re-set the check engine light. (The auto part store should re-set the check engine light for you if you purchase the O2 sensor from them, and be certain that it is the correct and assembled O2 sensor for your vehicle and not a put together universal O2 sensor)


Nov 29, 2010 | 1996 Mercury Mystique

1 Answer

Sensor 1, Bank 1 is stuck; mechanic says he does not want to force it and may have to take exhaust manifold off car--a very expensive repair. I would appreciate any ideas on how to loosen the sensor so it...

The only way that it will most likely come loose is to first soak the base of that O2 sensor in a good penetrating oil (liquid wrench, pb-max, wd-40) for a while before you attempt to remove the O2 sensor, then use a large 7/8" six-point box-end wrench (it will fit into a lot more spaces than an O2 sensor socket and a ratchet, and you will be able to apply a lot more torque to the O2 sensor) and cut the wire connector off of the old O2 sensor if the box end of the wrench does not slip over the wire connector. Once the box end of that wrench is firmly on the base of the O2 sensor you should have little problem getting that O2 sensor loose, and tap the end of the wrench in the direction to loosen up the O2 sensor using a small mallet if necessary (it never has been necessary for me, and the palm of my hand has always been sufficient).

You will have to use proper judgment, because if you can get the box end of the wrench described above on that O2 sensor you will be able to apply enough torque to break the O2 sensor off at the bung, or even rip the entire bung out of the ehaust manifold or exhaust pipe, but you would have to be really tugging on the wrench or beating on the wrench hard with a mallet to do so.

When you install the new O2 sensor be careful not to over-tighten it.

Bank #1 is always the cylinder bank that has the #1 cylinder and spark plug in it, and O2 sensor #1 is always the first O2 sensor in the exhaust system, and is either on the exhaust manifold itself, or just after the exhaust manifold on the exhaust pipe. Here is a diagram and bank #1 is composed of the #1, #3, and #5 cylinders and it is the exhaust closest to the fire-wall.


Jun 18, 2010 | 2001 Lexus RX 300

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