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post #1 of 3 (permalink) Old 09-19-2012, 11:13 AM Thread Starter
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Engine Sluggish

I have a 2006 Cobalt LS. Recently I have noticed that the problem of the car being sluggish for a few minutes after starting and that my fuel economy has fallen quite a bit. Here is a timeline of events.

Last year replaced catalytic converter.
Few months later check engine light came on (figured it was O2 Sensor)
August - Car needs inspected.
Changed Bank 2 O2 Sensor - Still didn't pass emissions. Test shows Bank 1 sensor bad too.
Change Bank 1 O2 Sensor - PASSED EMISSSIONS!!!
A few days after Inspection/Emissions was completed the check engine light came back on.
Car began to be sluggish for the first 2-3 miles of trips and gas mileage dropped 2-4 miles per gallon. Engine seems like it wants to stall out. Started happening after I changed the Bank 1 O2 Sensor
Car has 105,000 Miles so I did the following but the problem still persists.
○ Changed spark plugs
○ Changed air filter
○ Cleaned throttle body (didn't remove entire throttle body because it didn't look too dirty)

Could the Bank 1 O2 seonsor cause other engine issues?
Should I completely remove the throttle body and clean better?

What else could be causing this issue and what else should I try?
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post #2 of 3 (permalink) Old 09-19-2012, 11:48 AM
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Did you get an ACDelco or GM sensor , because these cars really hate the aftermarket ones like Bosch and other generics. They only last about 3 weeks. Are you getting a DTC code? It's probably your first HO2 sensor. There is only one bank of sensors on a Cobalt (Bank 1).

To answer your question if this can make your car sluggish, yes if you get no reading at all from HO2 sensor. Engine can even fall into limp mode if you try and give it the boot.

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post #3 of 3 (permalink) Old 09-20-2012, 05:23 AM Thread Starter
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I did get an aftermarket O2 sensor. I will purchase a GM or AC Delco and give that a try. Thanks for your response.
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