Catalytic converter problem, 57 plate petrol

[SouperJim]

Hi, I have a 57 plate petrol CRV which is throwing up an error code related to the catalytic converter.

 

My usual mechanic who I trust tells me the cat is knackered and needs to be replaced. Unfortunately he can only source a replacement from Honda at a cost of over £1k, so I'm looking for alternatives. Trouble is, I can find 3rd party replacement cats for every flavour of CRV under the sun, but not mine.

 

The Honda parts catalogue tells me my cat is part number 18160-RZP-G01, but there is also a presumably earlier G00 and a presumably later G50.

 

Can anyone advise me if these are all interchangeable part numbers?

 

Will a cat from a later CRV, but same generation and engine code, fit? I can find cats which are listed as for 2010-2012, but want to know for certain if these will fit my car before I put any money down.

 

Any and all advice gratefully received.

[Trevor]

I think I would look further into the diagnosis as not often that Cats fail they usually get damaged due to impact or overfuelling.

Sometimes could be something as simple as an air leak or faulty oxygen sensors giving conflicting readings.

What is the fault code that comes up?

[SouperJim]

P0420 cat efficiency

 

It's just had a reconditioned engine put in as total loss of coolant caused the original to sieze. Whether or not this could cause an issue with the cat I have no idea, but the exhaust also needs replacing in two places as it's coming apart. My mechanic checked the oxygen sensors and says it needs a new cat to pass the MOT, if the exhaust is in a state then I guess it follows that maybe the whole system has degraded. Performance is deffinitely impacted, which is consistent with the cat having degraded.

 

I wonder if it might be worth replacing the exhaust first and seeing if the cat problem goes away? The code has been cleared off and returns, but obviously there are other issues with the exhaust system at present...

[Trevor]

The only other cause for this code is if there is an exhaust leak and air is entering the system and the oxygen sensors are getting conflicting readings (due to the extra air).
If as you say, the exhaust system is defective and/or has not been secured back in the correct manner.

Let us know how it goes when you sort the exhaust system