Fault codes

invalid@example.com (JohnL), JohnL
Tue, 21 Jan 2025 23:13:46 +0000

I have a 2001 2.2 Z3 uk spec

I do not have any warning lights on the dash but when I scan using a fault code reader there are 2 codes
12 signal camshaft sensor exhaust
3E activation solenoid valve secondary air
Would really appreciate if anyone could help me with the following questions
1. As the MIL light is not on why are these 2 codes showing in the ecu
2. The camshaft code is clear but I don’t understand the secondary air code. Any ideas ?
3. Is there is list somewhere which gives a...

Fault codes