Question about 1999 Chevrolet Astro
That can be one of two things. IT can be the path that the coolant flows through from the engine to the heater core OR it could be the electrical wiring.
Posted on May 06, 2014
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Posted on Jan 02, 2017
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HO2S-21 (Bank 1 Sensor 1) Heater Circuit Malfunction
HO2S heater control circuit is open or shorted to ground.
HO2S heater power circuit open between the heater and PCM.HO2S heater is damaged or has failed.PCM has failed (it controls the heater with a duty cycle signal).The sensor is on the passenger side,that is cylinder number one.
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