Hey guys! I'm here with my '96 960, as I will refer to her as The White Rabbit or Tankie.
I'm relatively new here so, bare with me
October of last year, I got a diagnostic on her and they told me that 1) The fuel sending unit is faulty (which I know is a ton of money to fix at home or in a shop. 2) Both front sway bar end links have play; when I drive, I can feel it and it's terrifying.
Just recently, maybe 2 months ago, my engine light popped back on after repairing a broken vacuum hose to the SAI valve; I went into Advanced Auto and got a diagnostic on it again and it is now giving me two codes: P0410 and P0422.
Now I know P0422 is more than likely due to the faulty fuel control, but it's saying it can also be an air leak near the rear HO2S, or a rich air:fuel ratio.
Anyone ever had this code before and how did you go about fixing it?
As for P0410, it's the secondary air injection system is faulty, due to either 1) circuit relay defective or fuse open. 2) check connector and wiring or 3) air pump defective or hoses blocked
Again, if anyone has gotten this coding before, I need some advise and how to fix Tankie before she dies
She's only got a little over 200,000 and everyone knows that's just the beginning for these tough pieces of machine.

 

P0410 is Secondary Air Injection System Malfunction

90% of the time caused by a bad check valve letting water from the exhaust into the pump and causing the fuse to blow.


P0422 is Main Catalyst Efficiency Below Threshold (Bank 1)

This is measured by the difference in the pre cat O2 sensor(s) and the post cat sensor(s)...

It is plausible that the ecu thinks the cat is bad (or was in a short time) because of the air pump failure or that in combination with fuel control issues.

Check valves are easy to test as they should only allow air flow in one direction.

Best of luck.