Revised green 4 pin sensor, located in the cooling flange located on the side of the cylinder head
For vehicles with VIN from 3B-X-491,581, split is in the 1999 model year.
Connects the lower radiator port to the water pump and expansion tank
We Price Match - Give Us A Call or Chat! For vehicles with AEB or ATW engine codes only, with VIN from 8D-Y-120001, split is in the 2000 model year.
Brand:
ES#:
4696212
Mfg#:
4B0121055F
Ships in 1-2 days
$50.99
This product was last offered at the strikethrough price on 05-07-2026
<font color='blue'>Blue</font> sensor with square connector. Please check existing sensor color
For vehicles with VIN up to 3B-X-491,580, split is in the 1999 model year.
This kit includes both essential firewall lines, one connecting the heater core to the cylinder head flange, and the other connecting it to the hard water pipe.
2X Entries Into Our F80 M3 Sweepstakes
Brand:
ES#:
5482644
Mfg#:
8D0819373NKT
Ships in 3 Business Days
ON SALE!
SAVE 11%
$46.99
This product was last offered at the strikethrough price on 08-13-2026
Optimize your engine cooling system performance and heater output with quality drive belts, coolant hoses, cooling system parts, and approved coolant fluids from ECS Tuning. Head off expensive repairs and untimely breakdowns with regularly scheduled cooling system inspection and maintenance.
Lifetime Replacement
