Who is correct regarding the most accurate location to observe exhaust temperature?

• A. Technician A
• B. Technician B
• C. Both
• D. Neither

Answer: (B)

Technician B is correct. To get an accurate exhaust temperature, place the sensor as close to the source as possible—typically in the exhaust manifold or just downstream of the cylinders—before the gas has traveled through other components that can cool or further heat it. This location captures the true combustion temperatures with minimal lag and avoids the temperature changes caused by downstream elements like catalytic converters, sensors, or the muffler. If you measure farther downstream, readings become less representative of the actual combustion condition because the gas cools as it moves along the exhaust path and may be affected by catalytic reactions.