Fault code P2270 and P2271 on Aston DB9

[Majikz666]

Having a bit of trouble, wondering if anyone has seen P2271-sensor signal stuck rich and P2270-sensor signal stuck lean. Both O2 sensor faults on both banks. O2 were all replaced and fault has come back. All grounds were checked and cleaned as well. No catalyst faults, and car drives ok except for lite on with these faults in memory.