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P0546

Transit Mk6 & Mk7 Forum. All Transits 2000 - 2013

P0546

Postby rsjon » Fri Jun 15, 2018 10:09 pm

2013 2.2RWD with P0546 EGR Temp sensor circuit high.
Is this referring to the temp sensor before the cat that has wiring issues or a temp sensor on the EGR that I haven't dealt with before?
Thanks,
Jon.
rsjon
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Re: P0546

Postby rsjon » Sun Jun 17, 2018 9:44 am

I have worked this out and will share it now:
P0546 refers to pre cat Lambda sensor in the exhaust.
I checked all the wiring and connectors carefully but in my case it was an open circuit sensor (green sleeve) causing the problem.
Both sensors are supplied with 5 volts so check this first, then check resistance of sensors whilst very gently warming them with a blow torch...obviously removed and in a vice.
Resistance should be several Mega Ohm when cold, gradually dropping in resistance to at least several Kilo ohm when hot.
Hope this helps somebody!
Replacement tomorrow and happy days!
Jon.
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