00 civic si. B16a2. No internal mods. searched for this and my problem seems a little different. My mechanic has tried 3 different ecus and it is still throwing code 22. Between 1200 & 1800 rpms it makes a clank sound as well. Were honestly both stumped. Hes also checked wires and grounds. Please help!

 

obd1 ecu?

 

No its on stock right now.