SD> Mopar o2 sensor

[Mike]

Hi,
Thank you for the response to my code 52 question. I think that I had some ground issues but the problem is still not resolved. I just got back from the Dodge dealer where they quoted me $87.50 for a one wire o2 sensor, part# 5234921. Is this the right part for my '85 GLH? Is that the right price? I thought that would throw a new o2 sensor at it but for $87.50 I'm thinking twice about it. Can the old sensor be tested?
Thanks,
Mike McKeown