2 codes heated 02 sensor/2Nd several things.Service light on

Asked by Jan 09, 2017 at 07:52 PM about the 1998 Chevrolet Blazer 4-Door 4WD

Question type: Maintenance & Repair

Need a answer says heated oxygen sensor
and could be some type of switch and had a
new differential actuator put on and
newvacuum lines.alight didn't come on till
aftet

2 Answers

72,525

Sounds like a vacuum leak. A vacuum leak will often present itself as a lean condition at the upstream oxygen sensor. So check those vacuum lines. Especially since it didn't occur until after your Blazer was worked on. HTH. -Jim

20,105

Give the actual codes (ex: p0455) to get a better answer. If it's a heater circuit code you'll need an o2 sensor.

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