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[marrus69]

what now had bank 2 sensor 1 changed today,vauxhall one,code cleared done about 40 miles now showing this code  P0430 Catalyst System Efficiency Below Threshold (Bank 2) what the hell does this mean.ive had just about all i can take with this car.

[RobG]

what now had bank 2 sensor 1 changed today,vauxhall one,code cleared done about 40 miles now showing this code  P0430 Catalyst System Efficiency Below Threshold (Bank 2) what the hell does this mean.ive had just about all i can take with this car.

It`s not the sensor mate it`s the pre-cat falling below set emissions level, sensor needs to be moved to after pre-cat
http://www.omegaowners.com/forum/index.php?topic=90613.0

[tango]

just ignore it doesnt make any difference
i know the light can be annoying

[ndmv6]

swop the lambda sensors round n see how it goes,driving round with the light on is annoying,but doing this eventually leads to a duff cat,then things do start to get expensive...i learnt this to my cost...

[marrus69]

swop the lambda sensors round n see how it goes,driving round with the light on is annoying,but doing this eventually leads to a duff cat,then things do start to get expensive...i learnt this to my cost...

i think i would rather replace the cat.so is this the one at the rear not the top one,any links to the best place to get them.

[RobG]

swop the lambda sensors round n see how it goes,driving round with the light on is annoying,but doing this eventually leads to a duff cat,then things do start to get expensive...i learnt this to my cost...

i think i would rather replace the cat.so is this the one at the rear not the top one,any links to the best place to get them.

It`s the pre-cat on the downpipe. Megabucks from VX