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Some older vehicles had a single indicator labeled "trouble" or "engine"; this was not an MIL, but a warning light meant to indicate serious trouble with the engine (low oil pressure, overheating, or charging system problems) and an imminent breakdown. This usage of the "engine" light was discontinued in the mid-1980s, to prevent confusion with the MIL.
Some vehicles made in the late 80s and early-to-mid 90s have a MIL that illuminates based on the odometer reading, regardless of what is going on in the engine. For example, in several Mazda models, the light will come on at 80,000 miles and remain lit without generating a computer trouble code. Volvo had a light labeled "Lambda", lambda sond being another name for oxygen sensor. This was done in order to remind the driver to change the oxygen sensor.
All American production 19731976 Chrysler/Plymouth/Dodge/Imperial cars had a similar odometer-triggered reminder: "Check EGR", which was reset after service at a Chrysler dealership. The MIL light is also triggered prior to starting the engine, along with other lamps such as the coolant lamp and battery lamp, to allow a visual check to ensure the lamp is working and not burned out. The lamp will turn off once the car is started if no trouble persists.
Please help improve this section by expanding it. Further information might be found on the talk page. (January 2007)
Higher amounts of methanol/ethanol (or other additives) than the engine can handle efficiently may also trigger the malfunction indicator lamp (see E85). These burn differently from gasoline, and the EFI system may mistakenly interpret the oxygen sensor's readings as being incorrect. Oxygenated gasoline (ie. in California) may also cause this problem ("too lean" or "oxygen sensor" failure) in early EFI systems.
OBD-II PIDs ("Parameter IDs")
Check Engine Lights: Myths and Facts
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Categories: Auto partsHidden categories: Articles lacking sources from September 2007 All articles lacking sources Articles with limited geographic scope Articles to be expanded from January 2007 All articles to be expanded I am China Computer Parts writer, reports some information about fashionable maternity clothing , career maternity clothes.
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