Hi I have just put my engine back together after sorting out a slipped liner on number 4 (everything has been off). It runs and idles nicely but has no power and off idle seems to be fuel starved and has a few pops from the exhaust when revved (this might just be the pin holes in it) on connecting a code reader I find it has an error code P0130 and that's it. This appears to be a fault in the lambda sensor circuit. The lambda sensor has been changed for a new on on bank 1 and there's no change. The fault returns, using a blue tooth obdii device I see that if cleared and started I can see both probes working normally and left to idle they seem normal and the engine goes into closed loop mode. If you apply any throttle to raise the revs sensor 1 drops to .1v and stays there shortly followed by sensor 2. The engine then goes to 'open loop mode (Sys fault)' and when read the P0130 fault has returned.

This was not an issue before the engine was taken apart, so it's quiet probable something has not been connected correctly or the MAF has been damaged but I can't see that doing this?