Car has been to the dealership for a Engine Service Soon light with a code P0154,They replace O2 sensor for B2S1. Drove 53 miles Engine Service Soon light came back on. Then Technician checked fuel mixture-Ok suspect intermittent failure in PCM. Replace PCM. drove car 58 miles and then Engine Light came back on. Return car to dealership. Technician contact Mitsubishi techline confirmed diagnosis replaced B2S2 O2 sensor for code P0154. test with scan tool and test drove. I drove 28 miles Engine Service Soon Light came back on. Any solution?
Error Code: P0154
Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected
Problem areas:
- Wiring.
- Open circuit in signal wire, between Heated Oxygen sensor 1, Bank 2 and ECM. (Must check and confirm)
- Heated oxygen sensor (HO2S).
- Engine control module (ECM).
SOURCE: I have a 2002 Montero
80 % of all O2 Sensor Codes are from Vacuum Leaks
or EVAP System Vacuum problems
Engine misfires also set them, to protect the exhaust converter
Have a repair shop get down to the real issue
SOURCE: 1999 galant o2 sensor
have you had the car scanned for codes? the light could be on for something other than the o2 sensor
SOURCE: Ive just drove 20 miles in a 2006 1.1 Mitsubishi
May be one ' OF " ensure service (oil/filter) is not due !! Did yoy check oil/coolant levels ??
SOURCE: service engine soon light came on and later that day turned off
The reason for the light to come on an the after you have switched the vehicle off and back on again and the engine light stays dead is because the control units of the vehicle will reset when the ignition is switched off for 10sec. If the light stays off the it might be that the car got a wrong reading from a sensor and caused the engine light to come on. If it was a serious problem the light would have come on again
SOURCE: My 2004 Mitsubishi Montero battery
Sounds like your alternator is not charging your battery.
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