[allerton5]

hi,
just connected a obd reader to my 2002 316i
i have no engine management light problems
the reader has found 4 codes

any help please?
would i do any damage clearing these codes and going for a drive
codes found
PO340 camshaft position sensor a circuit
PO130 02 sensor circuit
PO135 02 sensor heater circuit
PO170 fuel trim

 

[TheEnd]

Clear them, drive the car for a bit and see what comes back.
It looks like you have a damaged lambda that isn't working, possibly a loose plug.

cam position sensor circuit does seem to mean your cam sensor is bust.

Both of those can cause the last one.