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Discussion Starter · #1 ·
I recently received the following code because of SES light: P0420.

I replaced the following part(s): NGK 24450, DENSO 234-9070 and Walker 53769.

The code cleared but 2 new codes appeared: P0137 and P0037.

What could be the cause of these codes? Also, what part(s) would I need to replace?

Any assistance would be much appreciated.
 
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