That is a code for an Oxygen Sensor (O2 sensor). Depending on your model and year it can point to a specific one if it has more than one on the vehicle.
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21 city/28 highway
Error code 21 for a 1995 Chrysler Cirrus typically indicates an issue with the vehicle's oxygen sensor or the system's fuel mixture, specifically related to the signal from the oxygen sensor being out of range. This can lead to poor fuel economy and increased emissions. It's advisable to check the oxygen sensor and its connections for faults or damage, and consider replacing it if necessary. Additionally, ensure there are no exhaust leaks that could affect sensor readings.
what is a code 21 on 1993 Toyota Camry 4cyl
Chrysler Group LLC PO Box 21-8004 Auburn Hills, MI 48321-8004
The code for Level 21 is 259205 The code for Level 22 is 279516
Code 21 indicates ECT out of self-test range
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The EPA mileage estimate for the 2013 Chrysler 200 is 21 mpg in the city, 29 mpg on the highway.
The EPA mileage estimate for the 2012 Chrysler 200 is 21 mpg in the city, 30 mpg on the highway.
The EPA mileage estimate for the 2011 Chrysler 200 is 21 mpg in the city, 30 mpg on the highway.
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