Temperature sender

The S1 has two temperature senders: brown (sends to ECU), blue (sends to dash). The blue temperature sender is notoriously unreliable and often fails, resulting in temperature readings approx 10°C lower than reality. The blue sender is also a "single wire" type which is affected by electrical load. In most cases, a 1°C rise in temperature can be seen when turning on each item of electrical equipment, e.g. headlights, heater fan, windscreen wipers.

The S2 (Rover engine) has a single (black) temperature sender for both ECU and dash.

The S2 (Toyota engine) has ???

Part numbers:

Car	Sensor	Rover No	Unipart No	Other No
Elise S1	Brown	MEK100060	GTR 313 / 185	Elise Parts
Elise S1	Blue	YCB100420	GTR 316	Elise Parts