Are you sure it's the sensor? And if so, which one? (a '98 should have two,
one upstream and one downstream of the catalytic converter). Oxygen sensors
sometimes fail, but more often than not a 'lean' or 'rich' code from them
just shows that they are doing their work and the problem is elsewhere.
Most often the O2 sensor is working and is just cluing you in to some
other problem, possibly a vacuum leak. Parts stores always tell their
customers to replace their O2 sensors because then they buy one
immediately. When that doesn't work, they suggest something else.
It's their business. Find the real problem and then go buy that
part. Don't shoot the messenger. Have the car scanned for codes and
post them here, you'll get some real help and direction.
I am glad my mechanic didn't change the O2 Sensors. Although, the car has
160000 miles on it. AutoZone checked the code and found P0442, evaporative
container. They had me replace the gas cap. If its not that I can work
from there. I did find the code on the web in a TSB. They have summaries
of the problem but not the solutions. I suppose I can call the dealer.
Thanks for everyone's help. John
wrote:
An improper sealing fuel cap can certainly cause that code, as can fueling
the
vehicle with the engine running.
It's also very common, on mid-late 90s Escorts, for the Canister Purge Valve or
the
Canister Purge Sensor to fail. So common that it is recommended to replace them
both
if one is found to be bad. The 2 parts came together in a kit from Ford as late
as '02
for sure. They may still be sold this way.
They still are, for about $70 for the kit, which includes the 2 parts and
the hard tubing
that connects them both. However, the code for that evap problem is usually
P1443.
A P0442 is more likely a small leak in the gas tank, filler neck or gas cap.
Thanks for the refresher Bob. I've been away since early 2001, many of those
brain
cells have gone to sleep. You're right, P1443 usually led to the Purge valve
and/or
sensor.
P0442 was common if the gas cap was leaky, or there were other minor EVAP
leaks.
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