This 2011 Chevy Equinox has 169,000 miles on it and came in with a P0420 error code. We have already replaced the catalytic converter on it.
In the diagnostic process, we observed the upper channel as Bank One Sensor One on the oxygen sensor, and the lower channel as Bank Two Sensor Two. We noticed that the voltage on Bank Two Sensor Two was consistently high, with no fluctuation in frequency. On the other hand, Bank One Sensor One exhibited a lot of frequency, which is indicative of a good catalytic converter.
During the road test, we observed a dip in the graph when the throttle was released. This is normal as letting off the throttle results in an increase in oxygen due to the fuel cut mode.
It’s important to note that a good catalytic converter should display these characteristics when graphing on a scan tool, especially when comparing Bank One Sensor One to Bank Two Sensor Two.
Remember, proper diagnosis is crucial in addressing error codes like P0420 to ensure that the right components are inspected and replaced.
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What is error code P0420 in a 2011 Chevy Equinox?
Error code P0420 in a 2011 Chevy Equinox indicates a potential issue with the catalytic converter.
What does it mean if the upper channel is staying at a very high voltage on the oxygen sensor in a Chevy Equinox?
If the upper channel on the oxygen sensor is staying at a very high voltage in a Chevy Equinox, it may indicate a malfunction in the catalytic converter.
What should be observed when graphing a good catalytic converter on a scan tool?
When graphing a good catalytic converter on a scan tool, you should observe stability in the readings with some fluctuations in voltage when comparing Bank One Sensor One and Bank Two Sensor Two.