Hi, My 620r since Saturday on the chip shop run has started playing up its new car purchased in November with 800 miles now on the clock, on sat morning when leaving home to travel to Chepstow when I fired it up it sounded a bit splutery and on the journey down I had a couple of splutery moments I put this down to perhaps some dodgy fuel anyway as the day went on it got worse and worse I refuelled twice so pretty sure not the fuel, in the end had to get recovered back homeostasis it was running so bad, I spoke with caterham on Monday and we agreed it was probably the Lambda sensor ( seems there is a issue on the 620 Lambda) and they now do a upgrade Lambda for the 620 including a remap to sort the issue, so I decided to buy a new standard Lambda and new plugs to get it running so I could get it to a dealer to have the upgrade carried out, fitted the new parts yesterday and the car is still running realy rough way to rich coughing and spluttering and won't tick over, the ecu has fault codes,P0120, P2226, P0401, P2022, P2604, I can read the codes but not delete them as the ecu is locked down, My local dealer can't get it in until 10th June and with the remap etc needed I can see it being off the road for a good few weeks, anyone had similar issues or shed any advice ???, cheers darren