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Old 05-03-2019, 01:36 PM   #9
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Location: Hudson, MA
What I Drive: 2002 Focus wagon 2.0L Zetec 5-speed

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Originally Posted by pcordes1979 View Post
Well odd thing happened as both the P0171 and P2195 codes have ceased but the P0420 cat converter below efficiency code has appeared. Though since last Thursday have not experienced any additional drivability issues either.

As for the readings maybe the front O2 read low voltage, all I remember for sure is the fuel trim was at +66 when I never generally see it go over +/-10 but fluctuating up and down normally. Maybe I was conflating what I remembered for the fuel trim with the O2 reading. Whichever the case got a front O2 on order as probably near time to change it anyways (has more miles on it than the one I took out when I first got the car).

Last year I got the code for the front cat converter failing and applied an anti-fouler to that O2 but now looks like I will have to do the rear O2 as well.

Interesting case, indeed.
Yes very interesting.
My 2005 ZX4 5-speed currently has 190K. Ive only had to replace O2S13 (sensor 3) due to an ongoing P2274 that started around 153K. It would come on and then after a few days go off. Once it was off scan tool would show no codes but it always came back after a few weeks. I replaced it last summer after CEL started coming on more frequently for that code and scan tool data would show intermittent no output from that sensor. A bit of a PITA to get out. Replaced with a Motorcraft sensor and no issues since although I dont drive much as its is my 'backup' car and my rusty/crusty 2002 SE wagon Zetec 5-speed (130K) is my work horse.

If you can please post up your experience changing out that O2.

2005 ZX4 SE 2.0L Duratec 5-speed 191K miles
2002 Wagon SE 2.0L Zetec 5-speed 135K miles
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