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stevanrk · May 23, 2007, 09:07 AM

So I managed to change the O2 sensor on my 1995 civic (major pain in the rear without the O2 sensor socket) with a Bosch model for my car. Ever since I did (this past weekend) I have noticed poor fuel economy with no change in driving habits. The one thing I did do which maybe I shouldn't have, was turn the car on to see what it would do without the O2 sensor once I removed it. The car ran fine and reved fine. I was surprised because I thought it would run roughly or not at all. Anyway, does the Bosch brand of O2 sensors have problems or is this a new problem? Thanks in advance.
Steve

TxGreaseMonkey · May 23, 2007, 09:14 AM

Here are my thoughts on the subject:

https://www.askmehelpdesk.com/cars-t...tml#post223376

stevanrk · May 23, 2007, 10:58 AM

Well I did use two good doses of WD40 to get the bolt loose on the old sensor, but I was careful as to not have any of that go into the manifold when I pulled the old one out and put the new one in. Could that residue still be contaminating things? Or do you think it is the Bosch brand right off the bat? Also, did I mess things up by running my car without the sensor (just to see what would happen)? Thanks again for the quick replies.
Regards,
Steve

Originally Posted by txgreasemonkey

Here are my thoughts on the subject:

https://www.askmehelpdesk.com/cars-t...tml#post223376

TxGreaseMonkey · May 23, 2007, 11:14 AM

If the Check Engine Light doesn't come on after the car is driven for several miles, and it's warmed up, then you didn't do anything wrong. Before it warms up and is driven for several miles, it's in "open loop" mode and the CEL won't come on. I believe your problem is because you installed a Bosch heated oxygen sensor. Make sure to remove the BACKUP fuse in the under-hood fuse box for 10 seconds, in order to reset the ECM. If the poor performance persists, I would consider replacing the sensor with a Denso.

carnut · Jun 7, 2007, 06:38 PM

be sure that it is properly installed so as to avoid problems. If your car has lost several miles per gallon of fuel economy and the usual tune up steps do not improve it. If the computer has issued a code pertaining to the O2 sensor, the sensor and it's wiring should be tested. Usually when the sensor is bad, the engine will show some loss of power, and will not seem to respond quickly. I've experienced these things when my sterling oxygen sensor was bad and it needs a replacement.