An exhaust gas analyzer  is used for the evaluation of combustion engines in order to detect and identify air/fuel drivability problems. These devices are used by mechanics, automotive repair shops, and authorized smog inspection stations to help ensure that vehicles meet emissions regulations. These hand-held devices measure carbon monoxide, oxygen, hydrocarbons and nitrogen oxide (NOx) in the vehicle’s exhaust system.

Most shop grade engine exhaust analyzers are designed to read two to five different gasses, mainly HC, CO and O2. Measuring four or five gas readings allows the user to narrow down potential driveability and emissions concerns, focus troubleshooting tests in the areas most likely to be causing the concern, and save time by eliminating unnecessary test and diagnostic procedures.

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The O2 sensor in an engine exhaust analyzer is usually electro-chemical and measures the amount of unburned O2 in the engine’s exhaust stream. An excessive O2 reading in the exhaust will indicate that fuel is being burnt incorrectly, and is often a sign of poor ignition timing.

Excessive carbon monoxide is a common problem that results from improperly burning fuel, and is typically caused by faulty spark plugs or an engine misfire. Most smog check-style gas analyzers are capable of measuring 0-10,000 ppm of CO, which is an important indication of richness or leanness in the fuel mixture.