MOT fail on emissions. advice please

[gm8]

So my 99 AGU failed on emissions ( and a couple of easy fixes) but i need some advice please.

C0 0.534
lambda 1.049
second fast idle test was slightly higher on both.

how can i tell if cat/lambda needs replaced ? would running the test without warming car up yield those results ? any other advice greatly appreciate. Car has done 101k and was serviced in march. Cotton air filer installed.

[Wayne]

Have you scanned it for codes.

[gm8]

will it flag up much being agu with no EM light ?

[MoMartin]

Agu still stores fault codes the same as any other car, it just doesn't have an annoying light to tell you that something is wrong

[Dalo Harkin]

If you scan it for codes and it is one of the lambda sensors you should get a 17521 code I think it is from memory.

[gm8]

right got the emission passed now thankfully , but still failing on the bloody handbrake new discs/pads , calipers rebuilt etc , i think one of the cables is stretched. ECP list 2 different length for my car though ?