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Have now sorted the P0136 DTC this was the 02 sensor.
The engine will now run for a while and go in to closed loop operation with the 02 sensor cycling properly. However, when it has heated up it will come out of closed loop operation and then just run in open loop (accelerating) with a 02 sensor voltage of about 0.7v.
The long term fuel trim is running at -18% and when the engine goes back in to open loop the short term fuel trim stays at 0% all the time.
Any advice would be welcome.