Many o2 sensors have gone bad but 50% of the time when a code is set on a car about an o2 sensor there is another cause which is changing the emissions & setting the o2 code (ex. vacuum leak, bad plug, injector, it could very well be the cat etc.) The root cause of the problem must be found NOT JUST READING CODES! TAKE YOUR CAR ELSWHERE.
SOURCE: severe hesitation, bucking
Change the plugs and the rotor insode the distributor. Sounds like your focus has either a hole in the Rotor Button, a cracked rotor button or the plugs need to be changed. Anotehr thing that would make your focus stall, **** and generally be a pain in the **** is: Fuel injectors out of hole; bad fuel injector; bad gasoline; Air filters need changing.
Those are basically some of the things that cause the Focus to jump and ****.
Later db In Tacoma
SOURCE: 2000 Hyundai Accent -Engine light
Check the O2 and mass air intake sensors. My girlfriend was having the same problem and not able to pass emissions. I forgot the codes. It will cost ALOT less if you can do it yourself. Relatively simple repair.
SOURCE: Check Engine light & slight hesitation
I had the exact same problem. The mechanic found a spark plug that was leaking on the back of the engine that was a pin to get to.
He replaced all plugs and wires and I no longer have this problem, so you may be onto something with the plug wire being loose.
SOURCE: check engine light due to MAP Sensor Mazda 2001 1.6L manual trans
the map sensor is on the passager side near the shock tower lot of time the plastic pipe that bring vacuum to the sensor break check it out pierre
SOURCE: 2002Honda civic ex jerks and hesitates when not accelerating
I would have the catylic convertor checked.
Then have the transmission check . I am guessing the transmission is automatic. The torque convertor could be shuttering when slowing down to a stop.
Hello
The
Engine and Automatic Transmission (not applicable to manual
transmissions) in this vehicles drive train are fully
electronically controlled by a computer called the PCM and TCM (Power
Train Control Module, Transmission Control Module). When a problem
like this or other drive-ability related problems occurs the computer
stores a record of the problem (there are of course some exceptions
to this, like the fuel pump, engine coolant temperature sensor and
MAF sensor for instance) in the form of a fault code in its memory,
to read these fault codes you must have the systems memory scanned
with a special tool. Once the fault code(s) are read you then must
perform the appropriate diagnostic testing to find and resolve the
problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED
TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD
EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM. Also always
check fuel pressure for correct spec for your make and engine type.
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