97 Explorer ltd. CEL
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Post Fiend
Joined: Nov 2008
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From: McKenzie River
97 Explorer ltd. CEL
Anybody care to clarify, 97 Explorer limited 4.0.....CEL code PO 133- 02 circiut slow........Vehicle runs fine, mpg great, no performance prob., had it cleared and took off on a 370mile drive, code has not recurred....If it returns, where do I start?.
Elder User
Joined: Jun 2007
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From: Humble,Tx
Hey there Amigo been along time since we've talked since our last conversation Me and the family joined the ranks of Explorer owners with the purchase of my Mothers 1999 Ford Explorer. ANYway in regards to your question it seems to me that maybe 1 of two things is occuring or maybe a combination of both. 1st. I'm thinking maybe that particular O2 sensors getting old and getting slow interms of electrical signal output. or 2nd. the O2 sensors somewhat dirty and it's taking it awhile to send the signal because of that. or Like I said maybe it's an issue of since it is old it's gotten dirty cummulatively over and extended period of time and thats reduced it's response time. either way those are just my thoughts on the issue 
...............Not sure about this but wouldn't these vehicles be setup with the redundancy system where in it uses multiple O2 Sensors incase ones failing??? If so this may account for the fact performance hasn't degraded
...............Not sure about this but wouldn't these vehicles be setup with the redundancy system where in it uses multiple O2 Sensors incase ones failing??? If so this may account for the fact performance hasn't degraded
Former ******
Joined: Nov 2004
Posts: 4,901
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From: Salt Lake City, Utah
O2 sensors should be replaced every 80,000 miles at the most. In theory they can last longer than that, but in reality, carbon deposits and other foreign contaminants causes them to degrade over time. The computer is constantly switching the fuel-air mixture between slightly rich and slightly lean. It uses the O2 sensor to monitor this and make sure this happens at the frequency that is expected. When the computer switches, and the O2 sensor doesn't respond in the required time, you get the code indicating the slow response. This is a pretty good indicator that the sensor is very close to failing.
Another reason to replace the sensor now. The exhaust system on your car is made from 409 stainless steel. The O2 sensor is made from either 409 or T304. When you put a stainless steel O2 sensor into a stainless steel threaded port, the two parts can weld themselves together over time. This will make removing the sensor very difficult if it is left in there too long. So when it does fail, your repair can become more difficult and expensive.
Another reason to replace the sensor now. The exhaust system on your car is made from 409 stainless steel. The O2 sensor is made from either 409 or T304. When you put a stainless steel O2 sensor into a stainless steel threaded port, the two parts can weld themselves together over time. This will make removing the sensor very difficult if it is left in there too long. So when it does fail, your repair can become more difficult and expensive.
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Post Fiend
Joined: Nov 2008
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From: McKenzie River
More questions
OK, no re-occurrence of original problem..... Now, wife starts it up this morn. and gets flashing "OD off" light, tell her to park it.....trans prob....30min. later I start it to take to trans. shop.......No flashing light, I give it a THOROUGH test drive,(city, hiway, hi-speed, engage 4wd etc) all is great, no lights, no problems......trans. fluid is clean and red, all is normal.........WTH!?!..I am getting sick of computerized vehicles!..........Any ideas about next course of action?
