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  • Bosch LSU 4.2 Wideband O2 Sensor Testing (2001 Skoda Octavia 1.6 (AVU))

    This is an excellent piece of work, bravo.I am currently experiencing some kind of similar issue on one Golf 4 BCB engine (petrol 1.6i 16V) :1) Heavy LTFT, around 50% in order to compensate for supposedly lean condition (which I do not believe).2) Fuel mixture made of 50% E85 (85% ethanol) and 50% SPE10 (unleaded petrol with 10% ethanol), which can explain LTFT compensation to some extent, but NOT up to 50%, that is way too high.3) Pre-Cat Wideband O2 sensor changed "not so long" ago... This warrants nothing.4) Fuel pump pressure checked, Fuel Pressure Regulator was faulty, replaced.5) Injectors cleaned to some extent.6) MAP sensor replaced.7) No obvious intake leak.8) No obvious exhaust leak.9) VCDS OBDII shows that pre-Cat wideband O2 sensor seems to be reacting to forced lean…

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    This is an excellent piece of work, bravo.I am currently experiencing some kind of similar issue on one Golf 4 BCB engine (petrol 1.6i 16V) :1) Heavy LTFT, around 50% in order to compensate for supposedly lean condition (which I do not believe).2) Fuel mixture made of 50% E85 (85% ethanol) and 50% SPE10 (unleaded petrol with 10% ethanol), which can explain LTFT compensation to some extent, but NOT up to 50%, that is way too high.3) Pre-Cat Wideband O2 sensor changed "not so long" ago... This warrants nothing.4) Fuel pump pressure checked, Fuel Pressure Regulator was faulty, replaced.5) Injectors cleaned to some extent.6) MAP sensor replaced.7) No obvious intake leak.8) No obvious exhaust leak.9) VCDS OBDII shows that pre-Cat wideband O2 sensor seems to be reacting to forced lean or rich conditions but...Checking the sensor electrically shows that :a) No measurable calibration resistance on the sensor connector side (provided that I got the pinout properly).b) 19.2 kOhm between H+ (basically battery V+) and calibration resistor pin, not good at all !c) finally, PWM heater control seems to be working properly, approx. 36% duty cycle seen on DSO when engine hot.My assumptions so far :1) definitely an issue with the calibration resistor within the connector body (resistor unsoldered, broken, physically displaced or something).2) maybe a slight short circuit (that would explain the 19.2 kOhm measurement) between calibration resistor and heater pin within the connector body.3) maybe a defect on the probe itself (that would explain the 19.2 kOhm measurement).In all cases, the next step is now to :1) Try and open the connector body to see if any visual failure on the calibration resistor side or2) immediately replace the wideband O2 sensor (easier way).Thanks again for your very nice work, it does help !

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