ok my check engine light just came on today while i was driving.. andso i keydanced it and the code was
1
2
2
1
55 (end of code reading)
does anyone know what is wrong here... hope nothing serious..

 

12 = battery removed within the last 50 cycles
21 = is vague but it deals with the o2 sensor


Here's a little more detail on code 21
http://www.exileracing.com/6g73/pcmcodes.htm

 

yes. i think i do need an o2 sensor. i think mine is bad... but what is with the battery removed within the last 50 cycles.. i know i changed it but will teh check engine light go off after a certain amt of time. and how much is an o2 sensor for our cars. and is it bad to run the car on a bad 02 sensor?
thanks for the help silver

 

well i looked on autozone website and they are asking about 60 for the o2 sensor..
and is it ok to drive on a bad o2 sensor

 

It's not horrible to run with a bad o2 sensor but it will and can drastically affect your milage. When they go bad the ECU will run a default fuel map and it's usually rich.
The last time I bought one it cost me somewhere around $100+ and that was for an OEM replacement. You're actually buying the convenience of a plug and play sensor as opposed to having to figure out which wires to use. Like the Bosch universals use 4 wires just like the stock ones but 2 sets are the same colors (i.e. 2 white and 2 black). It's really not that hard to match them up with the correct wiring diagrams but it can get confusing. The universals are around $50-$75. IMO, it's worth the $100+ for an OEM piece because it saves you the headache and it's not like they go bad very often. On the otherside of that, both of your sensors could be bad or you may have to try and figure out which one is bad if you have the V6. So, in the end, either will work. It's just up to you on how much money you want to spend versus the probable headache.

 

yea for the extra $40 i think i will go with the oem sensor.. its not worth the hassle.
Thanks for the help silver.