Symptom : Customer bought the used car and asked us to
check it. Also states Dashboard display is all screwed
up, not giving correct reading either.
Shop checked up
and found 2 DTCs are saved in PCM even thought it does
not illuminate.
DTCs were P0340 (Camshaft position sensor "A"
circuit)
P0174 (System Too Lean B2).
Next day, another check engine light code was ON, P0155
(O2 sensor heater circuit, B2S1)
Long Term Fuel Trim 10.14 (B1), 8.58 (B2)
Shop changed 1 cam sensor on intake side, b2s1 O2
sensor and advised customer LTFT need to be rechecked
later.
======
FRANCIS CAME HERE TO PICK UP THE CAR.
I REALLY HAPPY TO SEE HER AGAIN !!!
SHE GOT BIG CAR ACCIDENT COUPLE OF MONTHS AGO ON FRONT
OF SHOP !!!
I BELIEVED MY PRAYER WILL BE HEARD.
Old Camshaft position
sensor(left) and Newly-designed sensor (Right)
Oxygen sensor
2002 BMW 525i
oxygen sensor test process
before repair - B2S1 makes straight line, not working.
After repair - 2 oxygen sensors
work fine.
