can exhaust leak cause p0420|P0420: Catalyst System Efficiency Below Threshold。,cheek kiss gif

The exhaust system can suck oxygen into the exhaust flow through a leak due to the pressure differences. Consequently, the sensors will capture incorrect readings due to the extra oxygen, causing the PCM to set P0420. The。

An exhaust leak can definately cause P0420. Its letting extra oxygen into the exhaust stream. There are pressure pulses AND suction pulses that suck air in through that leak. The converter wont work right unless the exhaust has just the right amount of oxygen content。

Check for vacuum leaks and intake air duct leaks that would cause the ECM to add fuel. If you have high fuel trims, find out why before replacing anything! 7) Check for a clogged catalytic converter by conducting an exhaust。

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