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The P0140 code is caused by or is affected by the P0141 code. Fix the P0141 code first before worring about the P0140. It is good you had the connections cleaned as oil contamination will cause a problem with the O2 system. The "automotive electrician" should have performed a continuity test from the O2 sensor heater fuse to the PCM connector were the heater is grounded. The resistance value should be 35ohms. If the value is too high, the PCM will set the P0141 code. I would suspect you have an open circuit in either high or low side of the O2 sensor heater circuit. Good luck.
Codes alone don't tell you what to replace. I assume you mean catalytic converter. The converter should last the 10 to 15 years if nothing damages it. You now need to continue on and see why the o2 codes were set. The local shop should be able to take care of it. Just be there and be part of the process, so you know what work to approve. Don't take the vehicle back untill you go for a road test and see the codes are gone ,with the scanner on the veh. Take the scanner on the road trip
Hi the code P0139 is Bank 1 sensor 2 lambda sensor fault ,possible wiring or sensor fault even if you replace the sensor you need to have the MIL lamp turned off by a Diagnostic machine,it is possible you have another fault such as poor Catalytic converter efficency giving the same fault code ,Would recomend you get the car checked and read the "live" data as the car see`s it to make an accurate diagnosis and cure