How to troubleshoot an inoperative coolant temperature sensors on 2002 Mazda Protege?

When wanting to trouble shoot a coolant temperature gauge, check the fuses first. When the gauge indicates high temperature, enquire. Unscrew the electrical connector at the sending unit, and in case of reading falling, change it. Should the gauge not indicate on re-warming up, inspect the circuit or gauge. To replace, drain the coolant, remove wiring, and mount the new one firmly.

Genuine 2002 Mazda Protege Coolant Temperature Sensors

Coolant Temperature Sensor

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2002 Mazda Protege Coolant Temperature Sensor Part Number: B593-18-840A
$48.19 MSRP: $64.27
You Save: $16.08 (26%)
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Product Specifications
- Other Name: Sensor, Temperature-Engine Coolant
- Replaces: B593-18-840
- Item Weight: 0.70 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: B593-18-840A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
More Info
Fits the following 2002 Mazda Protege Submodels:
- DX, ES, LX, Mazdaspeed, MP3 | 4 Cyl 1.5 L GAS, 4 Cyl 1.6 L GAS, 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS

2002 Mazda Protege Coolant Temperature Sensors Parts and Q&A

Q: How to troubleshoot an inoperative coolant temperature sensors on 2002 Mazda Protege?
A: When wanting to trouble shoot a coolant temperature gauge, check the fuses first. When the gauge indicates high temperature, enquire. Unscrew the electrical connector at the sending unit, and in case of reading falling, change it. Should the gauge not indicate on re-warming up, inspect the circuit or gauge. To replace, drain the coolant, remove wiring, and mount the new one firmly.