I have Black Smoke coming from Santro plus 2001 on Fuel only not on CNG - having black smoke on petrol and fuel average of 8KM/L - On scanning the mechanic said there is P0130 (O2 Sensir Circuit) and P1146 ( Idle Co Potentiometer present open or short) Errors. he said the ECU is from some other car or other variant of Santro. Hence you need to change the ECU. As there is no O2 Sensor in any sensor in Pakistan ??
One Guy told me your Engine Fan is direct and no termostat assy (Valve) so there is no proper heat in the engine so thats why Fuel is not burning to the fullest.
Anyone please help