P0420 | p0420 catalyst system efficiency below threshold bank 1 | code p0420 | dtc p0420
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In this video, we’ll explain OBD-II trouble code P0420, which stands for:
“Catalyst System Efficiency Below Threshold (Bank 1).”
❓ What Does Code P0420 Mean?
The P0420 trouble code indicates that the catalytic converter in Bank 1 is not performing as efficiently as expected by the Engine Control Module (ECM).
This means the oxygen sensors have detected that the catalytic converter is not reducing harmful emissions effectively, possibly because the converter is failing or there is an issue in the exhaust or sensor system.
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⚠️ Symptoms of P0420:
🚨 Check Engine Light (CEL)
⚡ Reduced engine performance
🔥 Increased exhaust emissions
⛽ Poor fuel economy
🚫 Failed emission test
🔊 Sulfur or “rotten egg” smell from the exhaust
🔍 Common Causes of P0420:
🔥 Worn or damaged catalytic converter (most common)
🔌 Faulty upstream or downstream oxygen sensors
🔧 Exhaust leaks near the manifold or pipes
⛓️ Engine misfires causing excessive raw fuel in exhaust
⚠️ Faulty spark plugs or ignition coils
🛢️ Contaminated fuel damaging the catalyst
🛠️ How to Fix Code P0420:
🔍 Inspect and replace oxygen sensors if they are faulty
🔄 Replace the catalytic converter if it has failed
⚙️ Repair any exhaust system leaks
🔧 Fix engine misfires or ignition issues
⛽ Use high-quality fuel to prevent catalyst damage
🚗 Clear the code and perform a test drive
📍 Sensor Location:
Bank 1 refers to the side of the engine containing Cylinder 1.
This code involves both upstream (pre-cat) and downstream (post-cat) oxygen sensors, typically located before and after the catalytic converter in the exhaust system.
💰 Estimated Repair Cost:
Oxygen Sensor Replacement: ₹2,000 – ₹4,500 (per sensor)
Catalytic Converter Replacement: ₹15,000 – ₹40,000
Exhaust Leak Repair: ₹1,000 – ₹3,000
Labor Charges: ₹1,000 – ₹2,500
🚨 Is P0420 Serious?
Yes. Driving with a failing catalytic converter can reduce fuel economy, increase emissions, and may damage the engine if not addressed. It also causes failure in pollution checks (PUC).
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