02 mercury 4.0 engine code po136

Question

02 mercury mountaineer engine code number po136. 4.0

Answer 1

P0136 O sensor circuit malfunction bank 1 sensor 2

Oxygen sensor  responds to the engine condition, They do wear out due to mileage and  contamination,,and uncontrol engine condition ,such as vacuum leaks., coolant contamination, You may need a 02 sensor , P0136 is when the 02 sensor cannot generate a 0.5 volts