What does the code P0420 indicate when it comes to the Chevy Equinox?

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8 answers

★ Top Answer

Victor V Jan 25, 2021

When your Chevy Equinox shows a p0420 error code, it means there is a faulty oxygen sensor. By replacing the problematic oxygen sensor, you can usually clear this code. In more severe situations, the car's muffler may need to be repaired or replaced to eliminate the code. Additionally, exhaust manifolds with leaks could be a factor in triggering this code, so fixing the leak through welding typically resolves the issue. Sometimes, a catalytic converter might be the culprit behind this code. This is a common reason for its occurrence. While driving with this active code is generally not a safety concern, it is important to address it promptly.

More answers

Sheldon T Apr 20, 2022

I own a 2011 Chevy Equinox. I've had to change both sensors and the catalytic converter twice, and the muffler once. Even when I brake suddenly, the check engine light keeps coming on with code P0420.
Robert Tipton May 14, 2020

In a Chevy Equinox, if you see code p0420, it often indicates a malfunctioning oxygen sensor as the primary issue. Typically, this is the main problem associated with this specific error code.
Ava G Sep 15, 2022

Based on my findings and the range of symptoms, I think I've encountered a similar issue. It seems that it's likely due to a blocked pcv valve, which can lead to various issues related to pressure build-up.
Josephine B. Dec 2, 2022

Here's a paraphrased version: "I had a code on my wife's 2010 Equinox that I changed the catalytic converter for because it was very clogged. The warning light reappeared two days after I changed the O2 sensor. I noticed that the temperature sensor was not reaching 86 degrees. I replaced the sensor, but the problem persists. Can anyone offer assistance?
Garyejones Dec 16, 2022

Every half year or so, my car's diagnostic code reader shows the P0420 code. To fix it, I purchase a $20 Dura Lube catalytic cleaner and mix it in with the gas. In about one to two weeks, the warning light turns off. Additionally, I make an effort to fill up with top tier gasoline as often as I can to maintain a clean fuel system. Luckily, in my area, the price of the high-quality gas is equivalent to the less reputable options.
mr hardisty Jul 9, 2023

P0420 code indicates that the efficiency of the catalytic converter system is lower than the required threshold for the first bank.
Alice B Oct 30, 2022

I have a 2020 Equinox and the engine light comes on, showing that code, but then it suddenly turns off on its own and comes back on.

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