Volvo Owners Club Forum - View Single Post - 2005 V70 CNG gauge stay at 0 and did not switch to cng

CNGBiFuel · Jul 25th, 2021, 15:33

If they located as on 1999 cars the sensor is a pig to swap. Sits in the end of one of your tanks. It'll take you forever to blow-down the tanks to swap!

Below 7 Bar hte ECU will not switch to CNG/LPG. It gets a voltage from the sensor. Either your sensor or wiring is faulty. Unplug the sensor and put say 3.0V on the loom and watch to see if the gauge lifts. If it does, sensor has gone kaput. It might be easier to leave the old sensor in place and get yourself an AEB806 gauge.

AEB806 gauge.: These give the same 0.2 - 4.5V out put and you can adjust with a resistor or two anyway.

Bosch make the sensor, I have the numebr somewhere, it's about £30. Volvo want £350!

Jul 25th, 2021, 15:33	#2
CNGBiFuel Classic P80 1999 BiFuel Last Online: Mar 6th, 2024 00:34 Join Date: Aug 2012 Location: 48mph Middle Lane M4	If they located as on 1999 cars the sensor is a pig to swap. Sits in the end of one of your tanks. It'll take you forever to blow-down the tanks to swap! Below 7 Bar hte ECU will not switch to CNG/LPG. It gets a voltage from the sensor. Either your sensor or wiring is faulty. Unplug the sensor and put say 3.0V on the loom and watch to see if the gauge lifts. If it does, sensor has gone kaput. It might be easier to leave the old sensor in place and get yourself an AEB806 gauge. AEB806 gauge.: These give the same 0.2 - 4.5V out put and you can adjust with a resistor or two anyway. Bosch make the sensor, I have the numebr somewhere, it's about £30. Volvo want £350! __________________ Bifuel V70 Classic 1999 [The Old Grumpy in the Corner, "When I was a lad... blah, bl*dy blah."] Last edited by CNGBiFuel; Jul 25th, 2021 at 15:37.*