I have a problem with my car, whereby it gives the following fault from the code reader “Catalyst system efficiency below threshold (bank 1)”.

I have been able to obtain the following values from the sensors etc after the codes were removed:

Absolute throttle position 15.1%

Ignition timing 10º advance

Short term fuel trim bank 1 2.34% lean

Long term fuel trim bank 1 10.94% rich

Intake air temperature 35ºc

Bank 1 sensor 2 0.720 V

Before the codes were removed, the values at the point of the DTC occurring were:

Absolute throttle position 15.1%

Ignition timing 10º advance

Short term fuel trim bank 1 3.91% rich

Long term fuel trim bank 1 8.59% rich

Engine speed 1808.50 Rpm

Vehicle speed 25 Mpg

Intake air temperature 31ºc

I look forward to any feedback.

Greg