Your 328 is OBD II compliant. Personally, I'd wait for them to throw a code.
Of the 4 (are there really that many?) my money is on the ones that are
ahead of the CAT for failing first.
The difficulty is due to the tight work space, the sensors themselves are
replaced with a socket that looks much the same as a spark plug socket, but
has a slot cut up one side to accomodate the wire.
You can buy non-heated ones for less - check around on the
web to find how to wire them.
I agree with Jeff that there is absolutely no reason to replace
them before they actually fail and trip the check engine light.
I agree with the above. I am running over 116k miles and still with
the original sensors. I *am* however getting an "E9" code that one
converter efficiency is below threshold. Started sometime after 100k
miles. Went 11 months between occurrences.
Yes, about $110 or so, each, sensor alone. Not easy to get to.
This would be a really bad idea. You cannot use a non heated O2 sensor
on a car designed for heated ones. It *will* throw check engine light
at about 5 minutes after cold start because the sensor is not up to temp
There are generic heated sensors that you can get and then splice on
your old connector. Those are usually a bit cheaper. Maybe that is
what you were thinking of?
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