Cat Convertor - Fault Code Po430

[Rishi]

Hi folks,

I need some help. The dreaded engine management light has recently come on it to local Lexus dealer who very kindly without charge hooked it on the diagnostics and informed me it is the cat,but to see how it goes as they had reset the ecu. After a few weeks the light reappeared,so I took it to a independent garage and they informed me that the fault code was PO430 - "Below threshold Bank 2", which could be the cat.

I've had the car converted on LPG and have done just over 20,000 miles since conversion. On the net,I found the probable cause to be

cat convertor

wiring

heated oxygensensor.

When I brought the car,one of the oxygen sensor needed replacing with only 43,000,which I've just found out was Bank1,sensor2 (ie post cat,cylinders1,2,3). My gut feeling would be to replace the oxygen sensor bank2,sensor2 (ie post cat, cylinders 4,5,6). There is nothing else wrong with car,it is driving fine. Any thoughts would be much appreciated.

Secondly,I am informed the cat comes as part of the manifold is this true? and finally where is the best place to source the cat and oxygen sensors - although I've found oxygensensors.com in USA to be the cheapest?

Thanking you in advance.

[newport]

I have had the same problem for about 8 months now, Ive changed all 4 ox sensors and seemed ok for a while but dreaded light came on again dam dam.

I read the code with my laptop yea its PO430 and reset it, the light comes on again after a few days, Ive reset it and took her for MOT and past, (the light stayed off ) and she past all the testing.

I think it must be the CAT (or a wire), yes the CATs are a pair just off the manifold and not cheap, the car drives fine so im not worred ive driven 100s of miles like this for months.

If anyone knows where to get the cats at a good price ill change them both.

[Rishi]

I have had the same problem for about 8 months now, Ive changed all 4 ox sensors and seemed ok for a while but dreaded light came on again dam dam.

I read the code with my laptop yea its PO430 and reset it, the light comes on again after a few days, Ive reset it and took her for MOT and past, (the light stayed off ) and she past all the testing.

I think it must be the CAT (or a wire), yes the CATs are a pair just off the manifold and not cheap, the car drives fine so im not worred ive driven 100s of miles like this for months.

If anyone knows where to get the cats at a good price ill change them both.

Hi,

Thanks for responding. I did get some prices for cats (supply only):

Jap parts for less (tel 0844 880 4140) £232.88

DIY Motorist £222.08

Online Automotives £235.88

cheaptoyotaparts.co.uk - Chris Billimore quoted £541

Apparently cats can be steel or ceramic monolith and I think the steel ones are more expensive but allegedly more durable, as the ceramic ones can crack.To be honest I'm not sure what the above ones are.Requires a bit more research!