hmmm this could explain some cars and oil pressure issues when hot on some cars ie engine running to high due to thermostat housing and temp sensor faults, peuegt citroen also have this as well so its widespread through all prince engines from the dates on this up date sheet
link below for info
https://static.nhtsa.gov/odi/tsbs/2012/SB-10046779-4871.pdf
the latest update on pas cars is a new piece of wiring plus a thermostat housing with a 4 pin connector on the thermostat body
below link latest housing and other link the wiring upgrade,
https://www.ebay.co.uk/itm/Genuine-...653986?hash=item41d8e35f62:g:Q3UAAOSwgLlaXjxs
bi product of this not being right will effect many things with in fuelling 02 sensors and cat also a big impact on engine oil and how thin it gets with to much heat, bare in mind oil is tested to 100c the early cars run to 109c as cars get older this can have a impact also on how the vanos system works for timing, its all interconnected
link below for info
https://static.nhtsa.gov/odi/tsbs/2012/SB-10046779-4871.pdf
the latest update on pas cars is a new piece of wiring plus a thermostat housing with a 4 pin connector on the thermostat body
below link latest housing and other link the wiring upgrade,
https://www.ebay.co.uk/itm/Genuine-...653986?hash=item41d8e35f62:g:Q3UAAOSwgLlaXjxs
bi product of this not being right will effect many things with in fuelling 02 sensors and cat also a big impact on engine oil and how thin it gets with to much heat, bare in mind oil is tested to 100c the early cars run to 109c as cars get older this can have a impact also on how the vanos system works for timing, its all interconnected