Hi All,

I have a 2003 6s with 154K miles. Yesterday my CEL came on so I took it over to Autozone to have them read the code. It came up as PO421 which has 5 possible causes - the most likely of which seems to be a bad O2 sensor.("bank 1 sensor 1")

Has anyone replaced an O2 sensor in their 6? Is it too hard to do? My husband said he's up for trying, but I want to see if anyone has had experience here. Also, which one to I buy? I looked on the autozone website just to get an idea of the price and it seems that there are a lot of options.

I also learned today (pointed out by a coworker who was following me) that one of my brake lights is out - please tell me that the brake lights are not as hard to replace as the headlights!

I just had my inspection 2 weeks ago - seems like every year my car holds it together for the inspection and then I have a bunch of repair bills in May