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hey guys. my wifes chevy cobalt which is I believe a 2005 maybe 2006 /w 124k miles on it just had the check engine light pop on. I took it to o'rileys and they read the code for me which came out /w p0133. code definition-HO2S slow response sensor 1 then lists a few possible causes that all seem to relate to the 02 sensor. Am I looking at a serious problem here? I'm what most would consider "mechanically challenged". The guy that read my car's code said the part costs roughly 75$ but requires a special wrench.

thanks guys.
 

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To give you an idea, there are 2 HO2 sensors, the PCM compares the readings before and after the catalytic converter and will trim fuel accordingly. Very often this time of the year these sensors will not warm up fast enough because mornings are cooler and the heating element in the sensor has failed or has lost it's ability to heat the sensor. Your code P0133 is for the first HO2 sensor and this particular one will make her Cobalt hard on fuel if not replaced. Replace it, it will pay for itself in 3 months. The downstream is not so bad if you just lose the heating element but always good to change it just to turn that blasted CEL "off". Try to get an ACDelco or OEM, for some reason unknown the ecotec don't seem to like Denso and Bosch. Make sure you give them Year, and engine size.
 

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hey thanks for the responses. i'm not sure of it matters but (if it isn't obvious) it's a 4c 2.2l ls (if that makes any difference). Does anybody know the ballpark price range i'd be looking at taking it to a repair shop or is this really something I can do myself /w little knowledge?
 

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If you're not a grease monkey, take it to your friendly mechanic. No need to go to dealer on this one.
 

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If you're not a grease monkey, take it to your friendly mechanic. No need to go to dealer on this one.
exactly my thought too sir :) That should be the front 02 sensor before the catalytic converter. Takes nothing more than a 13mm wrench and a 02 (22mm) sensor remover with breaker bar. Heck, you can do too if you know any sense of removing a bolt. Just remove the negative terminal in the back for your battery, then remove the wire harness adapter (may take a flat head screwdriver to get it loose). Take that 02 socket and remove that, then back track the 2 steps and fire her up :) Simple.

And forgot very last step, clear the code with a scan tool like a Modis, Ethos, or Tech III.
 
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