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2007 Chevrolet Silverado Classic LS: Removing Cat Delete with Long Tube Headers - Impact on O2 Sensors and Engine Performance

Model: 02 sensor cat delete Fault Code: P0420 Posted: 2014-11-02 00:15

I own a 2007 Chevrolet Silverado Classic LS and have installed long tube headers with a new Y-pipe to delete the catalytic converters. I'm now not running either Bank 1 Sensor 2 or Bank 2 Sensor 2 oxygen (O2) sensors. My question is: Does this affect engine performance or cause issues with the Engine Control Module (ECM)? Will it just keep the check engine light on, or could it lead to long-term damage? I'm familiar with older truck systems but am not well-versed in modern electronic engine management. Any insights would be appreciated.

Related fault codes
P0420
Comments (3)
Anonymous 2014-11-02 08:05

If this vehicle is used as a daily driver, disabling catalytic converters (cat delete) is illegal and may result in significant fines—far exceeding any performance benefits. Additionally, such modifications violate emissions regulations, which means the public will not breathe cleaner as a result. This is especially true for vehicles on public roads.

Anonymous 2014-11-02 09:37

Thanks for the clarification—I use this truck primarily for off-road activities and not as a daily driver. I understand that cat delete is illegal for regular commuting, but my real concern is whether removing the rear O2 sensors (Bank 1 and Bank 2 Sensor 2) affects engine performance or causes issues with the ECM. As someone used to older trucks without advanced electronics, I'm trying to grasp how modern systems react when these sensors are bypassed. Any technical details would be very helpful.

Anonymous 2014-11-02 10:37

While some believe bypassing catalytic converters harms engine performance, it's not necessarily detrimental to the ECM itself. However, removing O2 sensors will cause the check engine light to remain on continuously. Over time, this may lead to increased emissions and potential sensor or system errors, especially under varying driving conditions. The vehicle might run less efficiently without proper feedback from these sensors.