O2 sensors

Anyone replaced the O2 sensors in your KJ? Seems my wife's 05 6 cyl, has had the check engine light on and we had the PCM reflashed as per bulletin, but the garage did tell us if the reflash didnt work, then the Bank 1 O2 sensors need to be replaced. How difficult is this to do?

I actually changed one on mine this weekend. the one after the cat on the driver side. Pretty easy DIY but i have a access to a lift which makes things easier...

I just ordered all new ones for ours.
Now it's just a matter of when they get here.

Just spoke to the garage, even though only 2 are bad they recommend changing all 4 to the tune of $550 out the door or we could do the 2 for $275 out the door.

You know you can do them yourself without too much trouble

Yes to do them is no trouble, finding the time to do them is a different story. I work 60 hrs a week. Im sure it wouldnt take me but an hour or so to do them, but its finding that hr to do them.

$550.00 Eh?
I'd take half a day off work and save some money!

I worked 113 hours last week and I find time to do all kind of stuff... well some stuff... well if I cut into sleep... not so much stuff.... but some stuff... Gotta use the time you got.

I would only replace the upstream sensors, unless a downstream sensor is throwing a code. The upstreams affect the fuel trim, while the downstreams are only there to make sure the cat is working.

belvedere said:

I would only replace the upstream sensors, unless a downstream sensor is throwing a code. The upstreams affect the fuel trim, while the downstreams are only there to make sure the cat is working.

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Not true. They actually have to do with fuel consumption by monitoring what is coming through the cat. It's in the manual somewhere. I would quote it if I had it right now.

A quick search of "downstream O2 sensor" found a bunch of info. Here's a couple links near the top of the list:
Catalytic Converters & O2 Sensors
OXYGEN SENSORS

I decided to go ahead an do the repair myself, picked up both an upstream and downstream O2 sensor and the sensor socket, Ill be tackling this on Friday assuming the weather holds out.

how the hell does anyone get up to the connector to unplug it? do you have to drop the exhaust and or starter for bank 1 sensor 1?

I was able to reach it from underneath.. granted it was a PITA though

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baer jeeper said:

how the hell does anyone get up to the connector to unplug it? do you have to drop the exhaust and or starter for bank 1 sensor 1?

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What year? '02 and '03 with the 45RFE have a different exhaust design and the cats are tucked WAYYYY up out of the way.

dude1116 said:

What year? '02 and '03 with the 45RFE have a different exhaust design and the cats are tucked WAYYYY up out of the way.

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late 06, it's looking like i may need to lower the exhaust or remove the front drive shaft,