Replaced plugs and O2 sensor, no change. Car has 80K miles. Most noticeable in 3rd & 4th gear.
If the engine has a miss or power loss, the check engine light should be on.
Is it ?
SOURCE: manual transmission takes effort to put in gear.
Have the clutch looked at. If the clutch is not releasing fully it makes shifting difficult. Have the trans fluid changed too, it isn't expensive and probably is listed under your maintanance in the owners manual
SOURCE: O2 sensor location for 2002 Ford Focus Sedan
to make you clear where does the oxygen sensors where is........... some have four, three or two, all O2 SENSORS ARE LOCATED AT EXHAUST PIPE. before and after catalytic converter,
SOURCE: Repalced O2 sensors, mass air flow sensor, and plugs error messag
dpfe velve
small emissions valve with one electrical connnector and three to four vacume lines located near your egr valve. this is a comon fault on fords emmissions system.
SOURCE: 1997 Ford Taurus, Won't Shift Past 3rd Gear
The forward clutch control valve has a retaining clip that is known to break on these tranny's. This can prevent it from shifting into 4th gear. Good news, the part is five bucks. Bad news, it's in the valve body which takes a few hours to get to. I fixed mine in about 8 hours thanks to great step by step instuctions I found online. Search for "valve body removal taurus tranny". If it's not the retainer clip then it could be one of the solenoids on the valve body. I believe there's one just for 3rd and 4th gear. Good luck
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