Question about 1999 Ford Explorer
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Posted on Jan 02, 2017
SOURCE: Upstream O2 sensor location?
That is the first sensor closest to the engine. The downstream sensor is the one behind the converter.
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Posted on Aug 31, 2008
Upstream, as in ahead of the converter, back toward engine. Start at converter and work your way back, should be on exhaust pipe or even on manifold.
Posted on Jan 11, 2009
oxygen sensor, vacuum leak, and yes it could most definitly be if you swaped the wires of the firing order accidently you will get a code p0171 Check the tubing going from the air filter to the intake manifold to see if it has come loose. This might account for extra air going into the intake manifold than the computer is aware of. Otherwise it may be due to a faulty(or dirty) MAP/MAF sensor. Another possible cause is from low fuel pressure due to restricted fuel lines or a bad fuel pump.
Posted on Jul 28, 2009
SOURCE: Check engine light
Sometimes can be prematurely dirty air filter, sets off the air flow sensor, which sets off the o2 sensor. So might try new air filter first and erase codes and then see, before you spend more bucks than you need; then if codes return, do the flow mix sensor.
Posted on Feb 11, 2010
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