Fault code 1221 on a non O2 car

[phildg2000]

Since I fixed my TPS, I now have access to my fault codes thru the stomp test. The problem is, I keep on getting a 1221 but my car is a euro 1989 525i (M20) and does not have an O2 sensor. Can someone explain why I get this code?

Thanks,
Philip

[632 Regal]

cause the O2 sensor is bad