That sensor is located on the right (rear) bank exhaust manifold. It means just what it says. It's getting old and slow. Clear the code and see if it returns. If it keeps returning, R & R the sensor.
Heated Oxygen Sensor
The engine light came on on my 2000 STS. I pulled the code P0133 -Heated Oxygen Sensor Slow Response Bank 1 Sensor 1. What does this mean? Should I replace this sensor? and Where is it located?
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Thanks Range. How many O2 sensors are on the 2000 STS? I see one thats under the hood at the rear of the motor and I see another one next to my catalytic converter. Which one do i replace?
There are 3. One on each exhaust manifold and one after the CAT. Bank 1 Sensor 1 is located on the right (rear) bank exhaust manifold (by the firewall).
Is this relatively simple to replace or should i consult a repair shop?
Hard to say without knowing your skill level. Bank 1 Sensor 1 is the hardest to get at, but it is doable.
do i need any special tools?
I believe you need a special O2 sensor socket. I have yet to have to change one so that is one tool I do not have, but I think it is just a deep well socket with a slot cut down the side for the wires.
No mention of a special tool in the FSM, but I can't advise since I've not enjoyed this failure (yet).
From your '00 FSM:
Document ID# 617960
2000 Cadillac Seville
Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1
Removal Procedure
Notice
Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.
Important
Remove oxygen sensors with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.
Important
A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.
From your '00 FSM:
Document ID# 617960
2000 Cadillac Seville
Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1
Removal Procedure
Notice
Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.
Important
Remove oxygen sensors with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.
Important
A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.
- Disconnect the rear oxygen sensor electrical connector.
- Remove the rear oxygen sensor from the rear exhaust manifold.
- Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
- Install the rear oxygen sensor in the rear exhaust manifold. Tighten Tighten the rear HO2S sensor to 41N·m (30 lb ft).
- Connect the rear oxygen sensor connector.
- Lower the vehicle.
The sensor can be reached from the top, with an extension between the firewall & cam cover. ( Possibly remove the coils?) Get the sensor socket.... It's the ONLY way to install the new one, anyway.
I bet you can do it yourself.
I bet you can do it yourself.
I purchased a bosch sensor and an 02 wrench kit today from Autozone. I believe I can get to the sensor from the top and as soon as my engine cools down I'll give it a shot. Any last minute tips?
Yes, return the sensor and get an A/C Delco sensor.
I can't figure out which sensor to change. Is the rear exhaust manifold on the right front of the car near the radiator or is it the one on the left side near the dashboard, if I'm facing the car?There are 3. One on each exhaust manifold and one after the CAT. Bank 1 Sensor 1 is located on the right (rear) bank exhaust manifold (by the firewall).
Bank 1 Sensor 1 is on the right bank exhaust manifold (firewall side). Bank 2 is the left bank (radiator side).
Thanks everyone especially RANGER. I got it right first thing this morning. Although i did have to buy a 6" extension to reach the darn thing I replaced it, cleared the codes, and P0133 or check engine hasn't come back on since. I also must admit that my STS is running noticeably quieter and smoother now. 
Well i just did this sensor on my 96 seville and boy what a job.
My problem was right where the sensor is theres a bar of some sort that runs across and kind of makes it hard to get the 02 sensor socket on it.In fact i got the socket stuck on there a few times.Got it off though and installed the new one.I had to buy a 10" extension to get mine off.Like ranger said its doable but not too easy!Especially with my big forearms and hands.:thumbsup:
Mike
My problem was right where the sensor is theres a bar of some sort that runs across and kind of makes it hard to get the 02 sensor socket on it.In fact i got the socket stuck on there a few times.Got it off though and installed the new one.I had to buy a 10" extension to get mine off.Like ranger said its doable but not too easy!Especially with my big forearms and hands.:thumbsup:
Mike
Do you feel any difference in the throttle response?Well i just did this sensor on my 96 seville and boy what a job.
My problem was right where the sensor is theres a bar of some sort that runs across and kind of makes it hard to get the 02 sensor socket on it.In fact i got the socket stuck on there a few times.Got it off though and installed the new one.I had to buy a 10" extension to get mine off.Like ranger said its doable but not too easy!Especially with my big forearms and hands.:thumbsup:
Mike
Are you guys talking about the strut tower brace? Why didn't you just remove it? Six easy to get at bolts and it is out of the way.My problem was right where the sensor is theres a bar of some sort that runs across and kind of makes it hard to get the 02 sensor socket on it.
Hmmm not sure ranger! This bar i could not tell what it was for but it was sitting like allmost on top of the sensor.Could not see or tell what it actually went to and couldn't see any bolts to get it off.Luckily i was able to get the socket on it.
Razor didn't drive it much today after i changed it but did notice it idleing alot better.Was going to do my plugs and wires and clean my throttle body today also but it started raining and hasn't quit.P*ssed me off lol.Hasn't rained down here in a couple of months and the day i want to work hard on my car it does.Boy i wish i had a garage.
Razor didn't drive it much today after i changed it but did notice it idleing alot better.Was going to do my plugs and wires and clean my throttle body today also but it started raining and hasn't quit.P*ssed me off lol.Hasn't rained down here in a couple of months and the day i want to work hard on my car it does.Boy i wish i had a garage.
I think you may be describing a coolant pipe? ( Twin 1/2" pipes strapped together ) ... I forgot about that thing...Hmmm not sure ranger! This bar i could not tell what it was for but it was sitting like allmost on top of the sensor.Could not see or tell what it actually went to and couldn't see any bolts to get it off.
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