few codes, few new parts, new battery....more codes and another bad ba

[nh9095]

Well about two months ago I got a CEL on my 05 v6. Hooked car up to Durametric and read 2 oxygen sensor codes and a blower motor regulator code and a couple others. Took it to a local Euro dealer who had previously done work to my vehicles. They hooked it up to their durametric, got the codes replaced my front 2 oxygen sensors, ac blower motor or regulator??, and invoice says the purge valve although I didn't know my v6 had a purge valve, I think it may have been a solenoid but listed it as purge valve. Cleared codes but then got a code for footwell lights and one that said: P1009 oxygen sensor behind - catalytic converter exchanged. Took it to Autozone and they tested my battery and it said bad battery. Took car back to the shop and they put in a new battery under my drivers seat. Cleared the codes and I drove the car for a week and all was well. Checked codes and none had returned. Then about a week later I got a CEL. Laptop battery was done so had to order a new one and when it finally arrived I hooked up the Durametric and had the p1009 oxygen sensor-catalytic converter exchanged codes. Also had code: p2270 Unkown dtc 18702; and code p2096 unknow dtc 1858, and code 1520 rain sensor/light sensor. Cleared codes and drove it for the day. CEL returned. Hooked up durametric and still had the o2 code and rain/sensor code and now a footwell code again. I dropped by autozone and it says battery is bad and also said something about 90% on the meter. Battery is an interstate battery w/ 2or3 year warranty. Any thoughts. I saw the original o2 sensors that were replaced and one had a tear in it so I feel most of the previous work was probably legitimate but why would my battery be draining? Also should the back o2 sensors go soon after the fronts or is this all probably just battery related? Thanks in advance. Car has 49,000miles and has been flawless to this point. Thanks in advance

[rizzo]

Has the alternator been tested?

[nh9095]

Has the alternator been tested?

no but it had crossed my mind. Need to call the shop and see what they say. Is the alternator an exspensive fix? Could it be a bad or miscorrect battery? thanks

[wvicary]

Yes new batteries can be bad or have a very short service life. You need to have the charging system tested and the fault codes properly diagnosed. If you get returning O2 sensors codes it doesn't always mean the sensors are at fault.