AboutDennis W Expertise I am a retired Ford master tech specializing in electrical, climate control, emissions, driveability, chassis, brakes, and any light repairs. Currently employed by an independent shop that appreciates my knowledge and abilities.
Cannot answer transmission or parts questions, these are not areas of my expertise.
Experience 32 years of auto repair, diagnosis, and emissions testing, in service staions, independent garages, and 20 years with Ford dealers.
Organizations National Street Rod Association (NSRA)
International Automotive Technicians Network (IATN)
www.blueovaltechs.com
IAMAW (retired)
National Street Rod Association
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Education/Credentials Riverside City College Automotive technology program
Ford Master Tech Certified Engine and Chassis Master (Over 500 hours)
ASE Certified in 7 categories
6 years training in Union 76 Pro-tech program
Awards and Honors 4-time Technician of the Year at Almaden Lincoln Mercury
Ford Master Tech
Union 76 Pro-tech Master tech
Question My 1997 Ford Expedition has been having problems. I stopped by an auto parts store and they read the computer code. They said it was P0133 which indicated a bad oxygen sensor. I would like to fix it myself if possible but cannot find any information about where the part is located, etc. Any help would be great!
Answer P0133 indicates a slow response rate for the bank #1, sensor #1. I NEVER replace a sensor without confiming with further tests. The code does not specifically indicate the sensor is the problem, further testing is usually necessary to determine if in fact the sensor is slow or there is a wiring or PCM problem.
In your case the sensor is most likely slow. I probably do at least 2-3 of these a week. But I do not rely solely on the code for diagnosis, it is only a starting point. At the shop I have equipment than can help me determine the ACTUAL cause of a code.
The sensor indicated by your code is on bank #1, is located BEFORE the catalytic converter, in the exhaust pipe, usually near the exhaust manifold. On Expeditions they can be very hard to access without proper tooling.
