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Discussion Starter · #1 ·
The check engine came on last week and did a scan. It read as possible cause O2 sensor bank 1 sensor 1, heater circuit control. Right after this happened there has been some issues with antifreeze too. We have to fill up the anitfreeze tank every other day. Took it to the mechanic and could not find any leaks, did a pressure check and everything was fine. Could the sensor cause this problem? I'm thinking there could be a possiblity that the anitfreeze is evaporating.

Which side is bank 1 and where is the sensor located on the catera? Any ideas what could be the problem?

Thanks.
 

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2000 Catera Sport
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390 Posts
found this on Google:
Bank 1 (cyl. 1-3-5 passenger side) Sensor 1 (first sensor from engine) is accessible from under car. It is located just before the catalytic converter.

And no that wont cause the coolant to disappear. I had the same coolant problem. no leaks and even pressure tests showed no pressure loss but it still ended up being a bad head gasket along with a warped head. If your coolant is disappearing and you have no drips or wetness on any part of the engine, you can pretty much be sure its leaking internally. I had to take my car in about 7 times before they finally figured out it was the H.G.

I think leaky head gaskets are common on this car as well as a number of other coolant leaks in the motor area. If it wasnt for Coolant leaks, I'd have no prob with this beast. ha! Good luck
 

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2000 Catera Sport
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Another possibility is the oil cooler/heat exchanger. I currently have this problem and am seeing a few drips from behind the motor and along the sides. If I look up from underneath the car, I can see coolant seaping out from where the heads and block meet on the pass. and driver's side. I also am refilling the coolant tank each month.

Just something else to look for.

Posting to look at:
http://www.cadillacforums.com/forums/cadillac-catera-cimarron-forum/61614-catera-coolant-leak.html
 
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