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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 65 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L)DIAGNOSTIC TESTSDTC P0420: TWC SYSTEM - LOW EFFICIENCYCONDITIONS FOR RUNNING DTC
2001 Chevrolet Cavalier LS, 2.4 T

Conditions For Running DTC

2001 Chevrolet Cavalier LS, 2.4 TSECTION Conditions For Running DTC
WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  • DTCs P0105, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0130, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0171, P0172, P0201-P0204, P0300, P0301-P0304, P0336, P0340, P0341, P0440, P0442, P0446, P0452, P0453, P0502, P0503, P0506, P0507, P0601, P0602, P1133, P1336 or P1441 are not set.
  • The engine has been running more than 530 seconds after the throttle has moved.
  • The BARO sensor parameter is more than 72 kPa.
  • The vehicle is in a closed loop operation.
  • The vehicle has been driven at more than 1000 RPM for more than 35 seconds if the vehicle has an automatic transmission.
  • The vehicle has been driven at more than 1000 RPM for more than 45 seconds if the vehicle has a manual transmission.
  • The battery voltage is more than 9 volts.

With vehicle stopped:

  • The engine is idling less than 150 RPM from the desired idle.
  • The vehicle is in Drive (A/T) or in Neutral (M/T).
  • The TP sensor parameter is zero percent.
  • The ECT sensor parameter is greater than 156°F (69°C), and less than 257°F (125°C).
  • The IAT is greater than -4°F (-20°C), and less than 176°F (80°C).
  • The short term fuel trim is -28 to 28.
  • The catalytic temperature is greater than 950°F (510°C).
  • The above conditions are present for up to 30 seconds.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.