I have just joined the forum and as techfella said, this is great info.
I have a 2004 Epica with 61000 km and the check engine light just came on. Would it be a safe bet to change the oxygen sensors without getting a computer reading or are there a bunch of other things that can be wrong? Also, I would be interested in hearing back from techfella as to the progress and difficulty of changing the sensors. I am fairly good with car repairs once I know what is wrong.
I would like to add that since I bought this car in Sept 04, it has been one repair after another and now that the bumper to bumber is over, I don't want to pay too much for repairs.
Thanks
Get a free code scan for sure! You could have other than a faulty O2 sensor causing the light to come on. Even if it IS an O2 sensor, the scan will tell you which one.
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Max is right about getting the code scan. After I had mine done, I found one other thing that with need fixing beyond the O2 sensors. The sensors haven't arrived yet so I can't give you any update on the progress. When I do jump on it I will let you know. I like my Verona, but from everything I've read the car has a bad rep on the reliability side. Parts are not that easy to find (aftermarket expecially) and the repair cost is about average. My plan is to get it back to a reasonable trade in value and sell it. Good luck.
You probably laid out some heavy $'s on all the sensors Tech. You COULD not take receipt of the soon to be delivered sensors you're waiting on (sending them back), or if possible, simply return the ones you don't need. Don't know what your suppliers return policy is. Just a thought.
Not sure of your location, but RockAuto out of NJ ships same day.
And Frenz...you can pick up a OBD2 scanner off e-bay for $30.00 plus shipping as I did IF you think that you could use it on future scanning needs as well.
Rock Auto is where I ordered from, paid in the $60-70 range. It did cross my mind to replace only the bank 1 sensor found on the scan and send the others back. I just figured if one is bad the others might not be far behind. Is that not good logic?
I will buy the scanner. I had no idea they were that cheap. I also had a discussion with my wife about getting my epica in trade in shape and selling. In Toronto, an Epica with over 60,000 km lists for about $10,000. Less than half what I paid 2 1/2 years ago.
When the car is running, it has a good ride and the styling, although not great is not bad.
Good thing I scanned my car. Nothing to do with the oxygen sensors. I got code P0700 (Transmission module) P0442 (small leak) and P1673 (hot engine light). GM changed my fuel guage sensor about a month ago. Is it possible that they caused the P0442 error? My gas cap seems to be fine. From what I have read, the other 2 codes are not anything to be concerned about.
I don't know what to say about your code issues. I wouldn't neglect any trouble code the computer spits out. Seems like the domino effect happens if you let one go, something else pops up. Example, I went to the dealer today just to confirm what Autozone found regarding the oxygen sensor. Now I'm getting two other errors, P1443 evaporator emmission value and one for the wheel speed sensor. What ever that is, the part cost $200+ they say it's a computerized sensor.
Anyway, I just got the O2 sensors today and will let you know how the installation go's.
Today I installed two of the four O2 sensors and it wasn't too bad. I had fewer issues with the plastic clips that Max reference because they are located on top of the engine near the firewall and easy to unplug. Getting to the sensors was not so bad on the passenger side, on the drivers side it's much tighter (which is why I stopped with two). The layout of the inline six is different than the pics Max put up. The way they are positioned in relation to the manifold and catalytic converted, lead me to guess the bank 1 sensors are on the passenger side because they appear before the CC (which you can't actually see because of a heat sheild). I will snap some pictures later this week and put them up. Anyway, I had the codes scanned and the P0031 is indeed gone.
However, more codes have surfaced so the engine light was back on within the hour. I have ordered the evaporator emission control system valve from the dealer (a $50 part) and will be replacing that soon. My bigger problem is that dreaded wheel sensor problem that has my ABS light on. This is something I will need the dealer to handle because I can't even figure out where they are
Don't know what your suppliers return policy is. Just a thought.
What ever that is, the part cost $200+ they say it's a computerized sensor. 
Update for whom cares
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