marpelto

Suddenly Car runs only with gasoline. Engine stops when it tries to switch to CNG. A Magnetic valve mulfunction?

Xentry gave this error. But didn't find anything from google.
P141B00 A leak (fine leak) was detected in the natural gas system on the high-pressure side

Any hints?

marpelto

The Xentry has another error
P01A900 Component 'B18/6 (GAS low-pressure and temperature sensor)' or 'Y107/2b1 (Gas high-pressure sensor) has an electrical fault. The system pressure determined by the control unit is implausible.

The B18/6 is on fuel rail. and Y107/2 is on CNG regulator. I guess either is faulty?

I did check the CNG regulator. The Sensor type is Fuel Pressure Sensor 110R-000123CKV4.2
Is there a way to test it?

It does not seems to be the usual analog resistor type.

marpelto

BUT..there is an issue with the sensor. It's STUCK. I guess..over time a steel bolt on alloy body will create some corrosion on thread. The nut is 20mm but the bolt part is very thin. I'm afraid that if I apply enough force, the bolt part will snap leaving the part inside the regulator body.



I'll try to add some heat to it first and add some WD40 maybe?

marpelto

Found the issue...very small debris was stuck in the valve making it leak excess pressure to fuel rail on LOW side...20bar instead ot 2-4bar. The computer put an errorcode because of that and never let run on CNG