Ken Finne 10/2/2012

2001 Hyundai Elantra GLS 4Cyl2.0L - Engine

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Check engine light is on

Heater circuit sensor 1 bank 1, what is the danger of driving with a faulty oxygen sensor?

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  CVO 10/2/2012

  The oxygen sensors supply the computer with a signal that indicates a rich or lean condition during engine operation. This input information assists the computer in determining the proper air/fuel ratio. A low voltage signal from one or more sensors indicates too much oxygen in the exhaust (lean condition) and, conversely, a high voltage signal indicates too little oxygen in the exhaust (rich condition). The oxygen sensors are threaded into the exhaust manifold and/or exhaust pipes on all vehicles. Heated oxygen sensors are used on all models to allow the engine to reach the closed loop faster.
  
  A faulty oxygen sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms.
  
  Related Symptoms
  
  Surging at idle
  Unstable idle
  Running rough off idle
  Hesitation
  Stumble
  Chuggle
  Poor fuel economy
  Spark knock
  Stalling on acceleration

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  Ken Finne 10/2/2012

  No apparent symptoms, fuel economy better than factory specs, slight knock, thought this was a valve lifter. Can it be fixed myself or is a trained mechanic required?

  

  CVO 10/2/2012

  DIY. See this repair guiide.
  Hyundai Car 1999-05
  Heated Oxygen Sensor
  OPERATION
  REMOVAL & INSTALLATION
  TESTING
  
  http://www.autozone.com/.../...rGuideContent.jsp