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To diagnose if this is indeed caused by an exhaust leak, look for signs like corrosion on pipes or hangers, cracks in components or any visible holes where air could escape from your vehicle's exhaust system 1) the exhaust leak will allow oxygen into the exhaust and result in an incorrect nitrogen oxide. Yes, an exhaust leak can cause a p0420 code.

An exhaust leak ahead of the catalytic converter is the second most common cause of this code Evap purge valve the evap purge valve is usually located near or on the engine. Any unmetered air that comes in contact with the oxygen sensor will cause it to read as if the exhaust is lean

The most common exhaust component to cause this kind of leak is the flex pipe

See this post to learn more about the flex pipe and how it fails 4 cylinder 06 ecotec developed a small exhaust leak aft of the cat a month ago I didn't have time to do anything about it so i left it Yesterday code p0420 [inefficient cat] popped up

The leak is about 12 inches past the converter and i'll have it repaired next week An exhaust leak can definately cause p0420 It's letting extra oxygen into the exhaust stream There are pressure pulses and suction pulses that suck air in through that leak

The converter won't work right unless the exhaust has just the right amount of oxygen content (very little)

Exhaust leaks are dangerous to your health If you smell the exhaust int the cabin you're getting a (un)healthy. If you suspect an exhaust leak, it could be causing various codes in your vehicle Learn what codes can be caused by an exhaust leak and how to diagnose the issue

Keep your vehicle safe and running smoothly with our guide to exhaust leak codes. Inspect for exhaust leaks and oil contamination sources such as leaking valve seals Clean throttle body and intake systems before replacing expensive components Use oem parts for sensors and catalytic converters when possible, especially for toyota and subaru

Consider pcm reprogramming or resets if hardware tests are inconclusive.

Discover the indicative signs, methods to pinpoint the source of the leak, and an easy fix. Leaks in the exhaust system, especially near the catalytic converter or oxygen sensors, can cause incorrect readings and trigger the p0420 code Repair or replace the damaged section of the exhaust system Repairing an exhaust leak can take one to three hours.

Here are the top 7 reasons for evap fault codes Loose or worn gas cap over time, the gasket on the gas cap can become worn and not seal correctly This can cause an evap leak Check your gas cap and make sure it is tight

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