Help with Trouble Codes please

[Wes8398]

I finally found a good OBDII reader that was on sale so I put it to work today. I've had my check engine light on for a few months now, including when the car was etested (and failed terribly of course). Etest shop told me that I needed new REAR o2's, so I replaced them. It was then re-tested, but none of my numbers came down at all. I got my conditional pass because the next repair was new cats, which an OE system was over $2,000. lol

Anyway, here are the codes I'm getting. These are "fresh" since the Etest, as I re-set the system after I replaced the O2's.

P0175 - system too rich - this is a "freeze frame" code and here are further details:
Fuel System 1 status: CLOSED LOOP
Fuel System 2 status: NOT SUPPORTED
Calculated load value: 24.71%
Engine Coolant Temp: 203 F
Short Term Fuel Trim BANK 1: -3.91%
Long Term Fuel Trim BANK 1: -8.59%
Short Term Fuel Trim BANK 2: -0.78%
Long Term Fuel Trim BANK 2: -16.41%
Engine RPM: 678 RPM
Speed Sensor: 8.08 MPH
P0153 - o2 circuit slow response (Bank 2, Sensor 1)
P0133 - o2 circuit slow response (Bank 1, Sensor 1)


I also have these same 3 codes duplicated in "pending" status ... not sure if that matters at all.

Important info - Emissions test diagnostics told me that my cats were running at 2% efficiency, so I know they're shot. I don't really care if I'm only getting these codes because of my cats, but I think there's more to it then just the cats. I've lost about 100 kilometers per tank in gas mileage.

So the first question would be are these codes being set just because of my cats? And if not, what's your guess at the problem(s)? Also, would "sensor 1" be pre or post cat? I wonder if the Etest guy told me to replace the wrong ones...?

 

[Mustangman9812]

Yep. Sensor one is precats and sensor 2 is after cat. He might have told you the wrong ones to change, as it is telling me that Bank 1 & 2 (Left & Right), O2 Sensor One (Before Cats) is bad. Thats how I read it

 

[Wes8398]

Great....well there's a starting ground for me at least, eh! haha The pre and post cat O2's aren't interchangeable according to most part sites ... is that true? Or will I be able to swap them?? Also, do you think the O2 sensor codes are what's setting the rich condition as well?

 

[AaRoN]

Great....well there's a starting ground for me at least, eh! haha The pre and post cat O2's aren't interchangeable according to most part sites ... is that true? Or will I be able to swap them?? Also, do you think the O2 sensor codes are what's setting the rich condition as well?

Yup.

 

[Wes8398]

Can anyone verify if I can swap front and rear O2's?? If it's just a matter of cutting off a tab or something, that's fine. But I want to be sure that they're operationally the same.

 

[Wes8398]

Anyone?

 

[Hybridbird]

Bosch lists the same part # for all 4 positions.

 

[Wes8398]

When I removed the rear O2's (the fairly new ones) they were absolutely COVERED in carbon. None of the perforations were clogged or anything, but they had a lot of carbon build up on 'em. Is that an indication of anything important? I already have a sneaking suspicion that my cats are shot, but I'm not worried about that ... I just want the engine running right.
One more interesting thing ... one of the rears looked to have a few drops of some type of liquid on it. I smelled it and didn't really get a strong gas smell or anything, but what else could it have been? When I wiped it off with my finger, it seemed to eat away the carbon and leave everything squeaky clean.
And FYI the old front O2's seemed to look "normal" considering their age. Nowhere NEAR the carbon build-up that the rears had. Actually, they were virtually carbon-free.
The "macro" setting on my camera wasn't working very well...but here are a couple pics. The fuzzy looking one is the one with the moisture on it ... you can kinda see it if you look closely.