The ESP light comes on randomly, causes some lose of power (limp mode?). After 5 or so illuminations (cancel after restart) the engine warning light comes on and code p0068 and p0068p appear on ODB2. 

Ive changed the chain, chain tensioner, oil/ filter, air filter, both MAF sensors new. Have cleaned all ABS sensors. Hypothesising that as ESP light can come on when stationary and idle maybe belt tensioner is on way out and periodically slowing belt affecting the power steering pump etc? Can’t hear any squeals from it though. Wondered if anyone else had this problem? 

Well, tried a few things and weirdly putting in Redex injector cleaner practically stopped all issues. 

ESP light has come on once since post. Am wondering if dodgy injector was throwing issues at OBC.