Universal Mechanical CEL Eliminator Fix O2 Sensor
On ODB-II vehicles (96+), the ECU has two O2 sensors for diagnostic purposes.
The first O2 sensor is located before the Catalytic Converter. This O2 sensor is
responsible for all the Air/Fuel tuning and is imperative to the operation of
The second O2 sensor is located after the Catalytic Converter. The whole purpose
of this O2 sensor is to ensure that there is a functioning catalytic converter
in the system. The way it can detect this is to make sure that there is a
difference in exhaust gasses between the first O2 sensor and the second. If the
same exhaust reading is detected, then the ECU knows that there is either a
damaged Catalytic Converter or no Catalytic Converter at all.
The ECU will then trigger a Check-Engine Light (CEL). On some instances, the
vehicle will be thrown into a "Null" mode where the vehicle will not go over a
certain speed and will be basically rendered useless.
This mechanical O2 fix is basically a way to space out the O2 sensor so that it
still reads SOME exhaust gasses but it removes the O2 sensor from the direct
flow of the gasses as to make the ECU believe there is a restriction in the
exhaust gasses such as by a Cat.
There are always mixed results depending upon the layout of the exhaust system
and the tuning of the ECU, however, this mechanical O2 fix is well known for
eliminating most CEL s caused by an O2 Sensor.
Some vehicles will need their ECU reset ( for example un hooking the battery for
10/15Minutes would do this)if the CEL is triggered before hand.