Running on fumes
Join Date: Feb 2007
Location: Dublin, Ireland
Strange Lambda Sensor Error
Iíve recently (for the last month or two) had a problem with an MCSF failure on my car.
Iíve checked, and the error given is always P0150 Ė Lambda Signal 2 above Cat No Signal.
Using FiatECUScan (very good!) Iíve graphed the response of all 3 Lambda Sensors also showing Engine RPM (see below). All readings were taken with the engine at operating temp (88-90C)
As you can see, the Bank1 Pre-Cat Sensor seems to be responding normally. However the Bank2 Pre-Cat Sensor is at a constant 0.465V.
My immediate thought was ďAh, itís a dodgy sensor, Iíll replace itĒ. However I did, and no difference.
So I thought ďWhat if I swap the sensors around to see if the problem replicates?Ē
I did this, and get the same basic output. This indicates to me that both pre-cat Sensors are working fine.
I also checked the wiring continuity from sensor to ECU, and this appears to be fine.
Anybody got any thoughts?
To clarify, the replacement sensor is NOT an OEM sensor. However it doesnít throw up any faults when connected on the other bank, so I donít think itís an incorrect resistance problem.
Also the car is a Ď01 147 1.6TS.
Thanks for any help, this is really bugging me.