Testing The Oxygen Sensors Ford 1.9L, 2.0L

Symptoms Of A Bad Oxygen Sensor

The effects of a bad oxygen sensor can be very subtle since they usually do not cause serious drive-ability problems. Here are the most common symptoms:

  • The check engine light (CEL) will be illuminated on your instrument cluster.
  • The diagnostic trouble codes lighting up the CEL usually are:
    • P0131 Upstream Heated Oxygen Sensor (O2S11) Circuit Out Of Range Low Voltage (Bank 1).
    • P0133 Upstream Heated Oxygen Sensor (O2S11) Circuit Slow Response (Bank 1).
  • Really bad gas mileage.
  • Won't pass state mandated emission testing.

More Test Articles

I've written quite a few 1.9L, 2.0L 'how to' tutorials that may help you troubleshoot the issues on your Ford Escort, Mercury Tracer or Ford Focus. You can find the complete list at:

Here's a sample of the Ford 1.9L, 2.0L articles you'll find:

  1. Crankshaft Position (CKP) Sensor Test.
  2. How To Test Engine Compression.
  3. Ignition Coil Pack Test (this info is found at: easyautodiagnostics.com).
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Ford Vehicles:

  • Escort
    • 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
  • Focus
    • 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009

Mercury Vehicles:

  • Tracer
    • 1995, 1996, 1997, 1998, 1999