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Exhaust gas temperature sensors are essential in modern cara, because they protect components that are located in the flow of hot exhaust gas from critical overheating. Some vehicles have multiple sensors that:
Test the exhaust gas temperature before the turbocharger.
Check the exhaust gas temperature before the diesel oxidation catalytic converter
Are fitted before/after the diesel particulate filter and/or the 3-way catalytic converter
A defective sensor can leave vital components unprotected, leading to potentially catastrophic and expensive damage and a significant loss of performance.