Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 739 (FUEL SYSTEM & EMISSIONS SYSTEM)HOW TO SET READINESS CODESEGR MONITOR AND READINESS CODEPROCEDURE
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
EGR Monitor and Readiness Code: Procedure
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Procedure
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the HDS to the DLC.
- Start the engine.
- Drive at a steady speed, with the transmission in D, at 50-62 mph (80-100 km/h) or above for more than 10 seconds.
- With the transmission in D, decelerate from 62 mph (100 km/h) or above by completely releasing the throttle for at least 5 seconds. If the engine is stopped during this procedure, go to step 3 and do the procedure again.
- Check the OBD status screen for DTC P0401 in the DTCs MENU with the HDS.
- If it is passed, readiness is complete.
- If it is not passed, go to step 3 and retest.
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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.