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Dealer says no. Car? 530 wagon--an '06

Driving the CEL came on. Next day it was out. We were on a road trip to see my sick sister across the province.

Going home, the CEL came on. So did the flat tire warning light (although pressure was as set when winter tires were removed.) All tires were properly inflated.

Dealer refused to read codes without an appointment. An independent dealer did, and reported with a printout that all 4 oxygen sensors were bad. Light went out before the car made it to the scheduled appointment. Dealer said no light=no codes.

Both lights were back on, then individually went out.

Dealer attempted to charge for service in follow up appointment. Still no codes, according to the dealer (reminded them we had a printout and explanation).

Car is nearly off of warranty, and I'm concerned.

What do you think?

Regards,
DaveL