thanks, - just one more question , would the injector shut off log any error codes ?

I had the codes read last time I had the car serviced and it read faulty O2 sensor right hand side and faulty brake light switch (the BAS and ETS lamps did illuminate once about 6 months ago, but never since).

The dealer suggested not replacing the O2 sensor as he didn't think it would fix the problems I was having.

thanks

Doug