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What code is it giving ? p0172 system too rich bank 1 ? If it is staying around 0.8 millivolts try introducing a vacuum leak an see if it goes lean ! If it does it is working fine . You probably have leaking fuel injectors or a fault fuel pressure regulator ! You need a better scan tool to check fuel trims , short term am long term ,to see if the computer is adding or subtracting fuel ! Oxygen Sensor Test fixed rich signalFord O2 Sensor Testing
Disconnecting the battery should reset it but I would bet that the light will come back on. I would have a auto parts store read the error code for you. They can also reset it. There are two o2 sensors on this car one on the manifold and one down stream from the converter. If you are getting an o2 error code it could also be the converter.
You need to have a computerised car diagnostic done in order to read an error code( if any) ..Try to reset and clear the code and test the vehicle, if check engine light re-appears then you need to retrive the code of this fault and take this further...Hope this helps,good luck.
The following are malfunctions that could cause a rich condition:
^ Fuel pressure too high. Perform fuel pressure test.
^ Leaking fuel injector(s). - Perform pressure leak down test.
^ Vacuum leak around the MAP sensor grommet.
^ Oxygen sensor contamination.
^ Restricted exhaust or air intake.
^ Fuel Vapor Canister saturated with fuel.
IMPORTANT: If the front oxygen reading voltage is above 600 mV and the rear HO2S is above 600 mV all the time, the O2 sensors are probably not
The best thing to do is go to Auto Zone and get your Hyundai scanned for a DTC code. That would tell us which O2 sensor has gone bad. You have three O2 sensors and one of them has gone bad, the O2 sensor sends signals to the ecm to control the air fuel mixture so it will not run to rich or to lean which is causing you to fail the state inspection. Good luck and keep me posted on what the DTC codes are, be glad to help.
Yes, the Computer, on your car detects, all sensors . I, would recommend going to Auto Zone,
and have a Code Reader , recheck your car after
you disconnect negative battery cable, for at least 5 minutes, will wipe out memory and reset problem codes, after you start engine. You will start a new set of any problem codes.
P.S. Auto Zone, no charge for Code Reader, a Dealer will charge at least $ 75.00 for a 5 second read ! Not !!! get it read for free.
no such thing as a catalytic computer... there is a catalytic converter ... part of the exhaust system so they may now be "guessing" that it's an O2 sensor. take the car to autozone... they will scan the codes for free.... post the codes here tho the lads and lasses there are pretty clever and will probably tell you what the codes mean.
if you had it replaced it should have already been set however you can reset your cars computer
by taking the positive battery cable off the battery and waiting 2-3
min and then touching the positive cable from the car to the negative
cable which is still attached to the neg post on the battery for about
5 sec and the hooking it back up. that will reset the computer which
would configure any new sensors. when the computer reads a bad code it
bypasses that sensor so your car will run. it wont run to the best of
its ability though - that's why you didn't pass an inspection. when you
replaced the sensor the computer didn't notice because it already
stopped reading that sensor when it went bad and doesnt know about the
new one. when you reset the computer as i told you then it will read
the new sensor and work properly.