Question about 2002 Acura MDX
Replace O2 sensor the sensor is not preheating to the appropriate temp in time for cold start lean out
(it will use more gas upon start ups)
Posted on Jul 03, 2009
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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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