Question about 1998 Kia Sephia
Hello adam...i suspect you are getting the P0140 O2 sensor circuit no activity (Bank 1 Sensor 2) fault code on your Kia?
The "downstream" O2 sensor will be BEHIND the catalyst converter and is tuned into the PCM map. Simply remove and replace. Typically this code is set due to a clogged or failed sensor, a poor connection, or an open circuit.
The P0420 code is typically a clogged or defective cat.
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Posted on Jul 24, 2009
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Posted on Jan 02, 2017
the o2 sensors are locted in the exhaust system. upstream is before cat converter, downstream is after cat converter.
Posted on Nov 22, 2008
SOURCE: Po136- bank 1 sensor 2
this code is for the 02 sensor heater...there is a relay that sends the voltage to the sensor that may have malfunctioned or there may be no voltage to it
Posted on Jan 26, 2009
the sensors before the catalytic converters are the upstream sensors, the ones after the after the catalytic converters are the down stream sensors, Ford calls them the Catalyst efficiency monitors.
Posted on Apr 26, 2009
SOURCE: 02 sensors not ready
The code P0420 indicates that the catalytic converter is not functioning efficiently. This could be because the cat is damaged or the engine is not running very well and the cat cannot keep up with the emissions. You should ensure that the spark plugs and ignition components are in top shape before replacing anything else. If a compression check reveals a low cylinder, you will not be able to prevent this code as even a new cat cannot keep up with a dead miss. If the state of tune and the compression is good, then you'll likely need a cat.
I've posted the drive cycle just so you know what to do when you have resolved the code.
Do not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run.
Posted on May 14, 2009
SOURCE: P0420 and P0430
The AF sensors are uupstream and the O2 down stream. The car' s computer tests them and it is saying your cats are bad. If you have a scan tool you could look at the data and see what the sensors are seeing. The Af sensors are the ones that control the fuel ratio in the car while the O2's just watch. AF's would be the one to change but there is no garuatee that the codes won't come back.
Posted on Sep 25, 2009
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