What is P2003 code? Equivalent to P0410?

Yes the SAI pump runs during cold start for 90 seconds, but the tests are done after the engine is fully warmed up and after certain conditions are met. The test is done when the car is stopped. Two consecutive drive cycle faults cause the fault code CEL to pop up. You should see a pending fault code after one failure of the test. The test runs only few seconds.

 

In ME2.8 code P2003 is exactly the same as P0410. Secondary air injection activation without expected result.
Expected result is rapid drop of front O2 sensors voltage. Below 40mV within 30 seconds.

Here is deliberate trigger of P2003.

P0410 Secondary Air Injection cleaning

After 20 years, I got my first P0410 Secondary Air Injection and the CEL. I cleared it and it did not come back yet after 2 days. The Air pump works. K28 relay is good. Curious what sets up the P0410 and CEL? I did not remove the screw to open the valve and see the reed valves, yet. I...

www.benzworld.org