what is p0153

Question

what are p0153 p0156 p1151 p0174

Answer 1

P0153 -02 sensor circuit slow response Bank 2 Sensor 1

P0156 -02 sensor circuit malfunction Bank 2 Sensor 2

P1151 Lack of upstream heated oxygen sensor switch sensor indicates lean Bank 2

P0174 Fuel trim lean Bank 2

The lean condition has to be fix first before diagnosis of the oxygen sensors, Lean condition will set a 02 sensor codes. Bank 2 is the other side of Bank 1, Facing the front of the engine Bank 1 is on your left hand, Bank 2 is on the right hand facing the engine. There is a brake booster hose that goes to the intake manifold check that hose for any vacuum leaks that hose tends to crack. Check also the PCV hose that area tends to have vacuum leaks.

 This is a PCV hose connection on a Ford engine that set a lean Bank code. you can see where the vacuum hose rupture which allowed unmeter air to enter into the intake causing a lean condition