My 2001 XL7 have the service light on, and the diagnostic codes I get are:
P0131 - Oxygen Sensor Circuit/Heater Low Voltage (Bank 1, Sensor 1)
P0133 - Oxygen Sensor Circuit/Heater Slow Response (Bank 1, Sensor 1)
P0131 - Oxygen Sensor Heater Circuit (Bank 1, Sensor 1)
So, my understanding is that it's time to replace the oxygen sensor...
First question: how difficult is to change it? I read that you need to go under the car to replace it. Can I do it without lift up the car? Can I use one of those plastic blocks to lift the front of the car to do an oil change?
Second question: I read you need some special tools to replace the sensor. What is it exactly? Can I do it with just a normal wrench?
What is Bank 1 Sensor 1? Is it the one on the driver side or passenger side?
The size of the tool should be 22mm standard for all the oxygen sensor... and the page says also:
> Hex: 7/8-inch (22mm), 6 point
Cool I'll get that too (noticed that Amazon carry also the heated Bosch oxygen sensor I need).
Regarding the service manual, no I gave up... and I haven't been following the forum too much. But the link you provided is great, I'm downloading the PDFs now... (boy that download site is really a PITA...).
The svc manual will be very helpful also to fix few other small issues (before the problem with the oxygen sensor, the service light was turning on once in a while because of a problem with the evaporative system... or something like that, don't remember anymore as I got so used to ignore it...)
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