Engine management light

mrfixer · Sep 15th, 2020, 13:33

Hi I’m looking for some help fixing my 2003 v40 2.0 automatic I have a code ECM-1C Rear heated oxygen sensor (H02S),preheating.signal missing.
I have replaced oxygen sensor still have the code,checked wiring to sensor from ecu no problem with connection. Voltage going to sensor heating is 5 volts disconnected connected voltage drops away. M.O.T due in a couple of weeks So not much time to fix ☹️

magnuz · Sep 20th, 2020, 20:02

Are you sure that the 5 volt is for the heater part of the O2 sensor ?
Some of these models use a titania sensor which needs a 5 volt feed, as it does not produce it's own voltage like a zirconia sensor.
The heater part of the sensor will most likely be 12 volt, but it may only need to be active for a few seconds to get it up to temperature, so unless your checking it when you first start up, you may not get any reading for it ?

mrfixer · Sep 22nd, 2020, 10:20

I don't know what was going on but I checked everything that gets a twelve volt feed on the same circuit and all was fine. The sensor I replaced it with was an aftermarket one was wired up wrongly so I sorted the pins into the correct position and hey presto all is good code removed with Vida 👍

Sep 15th, 2020, 13:33	#1
mrfixer Member Last Online: Apr 23rd, 2024 12:35 Join Date: Nov 2008 Location: Livingston	Engine management light Hi I’m looking for some help fixing my 2003 v40 2.0 automatic I have a code ECM-1C Rear heated oxygen sensor (H02S),preheating.signal missing. I have replaced oxygen sensor still have the code,checked wiring to sensor from ecu no problem with connection. Voltage going to sensor heating is 5 volts disconnected connected voltage drops away. M.O.T due in a couple of weeks So not much time to fix ☹️

Sep 20th, 2020, 20:02	#2
magnuz Ancient Last Online: Apr 23rd, 2024 20:31 Join Date: May 2012 Location: chesterfield	Are you sure that the 5 volt is for the heater part of the O2 sensor ? Some of these models use a titania sensor which needs a 5 volt feed, as it does not produce it's own voltage like a zirconia sensor. The heater part of the sensor will most likely be 12 volt, but it may only need to be active for a few seconds to get it up to temperature, so unless your checking it when you first start up, you may not get any reading for it ?

Sep 22nd, 2020, 10:20	#3
mrfixer Member Last Online: Apr 23rd, 2024 12:35 Join Date: Nov 2008 Location: Livingston	I don't know what was going on but I checked everything that gets a twelve volt feed on the same circuit and all was fine. The sensor I replaced it with was an aftermarket one was wired up wrongly so I sorted the pins into the correct position and hey presto all is good code removed with Vida 👍

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)