Checked the code with Forscan. It happened twice on the highway under full throttle.Thank you for posting back! How do you know the CEL was caused by the pressure on the rail?
I have also installed a Racechip on my 2.2, yet I have not driven it a lot. It definitely seems a lighter car. On map6 and 7 I can hear more of the high pitch cold diesel engine clatter. More turbo sound too.
The TDI chip promisees a lot of increase especially in HP. For my engine, RC claims 190hp while TDI claims 211. Huge difference compared to the stock 160hp.