Gazzamit

Budding Enthusiast
  • Content Count

    4
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About Gazzamit

  • Rank
    Newbie

Profile Information

  • First Name
    Gary
  • Ford Model
    Mitchell
  • Ford Year
    2008
  • UK/Ireland Location
    Devon
  1. I took a few more Forscan readings and am very confused by what's happening. The red trace is ECT.OBDII - Engine Coolant Temperature The Green trace is O2S11- Heated Exhaust Gas Oxygen Sensor (bank1, Sensor1) (upstream). The Blue trace is O2S12 - Heated Exhaust Gas Oxygen Sensor (bank1, Sensor2) (downstream). The yellow trace is HTR11 - Heated Exhaust Gas Oxygen Sensor Heater (bank1, Sensor1). After cold start the car reached 100 degrees in about 15 minutes and only then did the yellow trace toggled to on (HTR11). Shortly after the green trace (O2S11) starts to oscillate (first image). Later on when driving the Yellow trace can be seen to toggle on/off. When its 'on' there are corresponding O2 sensor oscillations (second image). Is this normal behaviour? The O2 sensor seems to only oscillate when the Heater is activated or am I misinterpreting the data? I thought the heater element would be on immediately after a cold start and would only toggle to off when operating temperature is reached. Additionally, I checked the resistance of the heater element (white wires) and its open circuit when the car is cold. Any recommendations or advice?
  2. The car was cold started in the morning. It oscillates right away (tested three days in a row first thing). It stops oscillating as soon as I rev the engine and starts again imediately on idle. I'll see if I can work out the pins and do a resistance check.
  3. Ah right, thanks thats really helpful. Presume this the sensor after the cat (the 0.4V to 0.6V and accessed under car)? Presume it should it read 0.6v from cold start? Do you think the one before cat is OK (oscillates from 0v to 0.8V and accessed under bonnet)? Regards, Gary.
  4. Hello, This error keeps reappearing and the car failed emmisions test. Sensors seemed OK, so I thrashed it for 20 minutes and it restesed OK. The images show readings from cold start (40 degress) to hot (102 degrees). The readings for sensor before minicat oscillates from 0V to 0.82V. The second downstream sensor changes from 0.4V to 0.6V as engine temperatures rises. This all looks OK to my inexperienced eyes, howeer, the DTC returns every day now. Do you have any advice or other troublshooting tips? Regards, Gary.