Traditional gasoline car fault

2003 Mercury Sable P0420, P0430, P1131 and P1151 - Rough Idle, No Power, and OBD-II Diagnostic Codes

My daughter drives a 2003 Mercury Sable that has been experiencing severe idle roughness and a lack of power. The vehicle can only maintain speed at around 20 mph when climbing ...

2003 Mercury Sable | P0420

P0420 Fault in 2012 Ford Focus Flex Fuel Engine: Diagnosis and Solutions

Hello everyone, I'm experiencing a persistent P0420 code on my 2012 Ford Focus flex fuel engine. Originally, I had three trouble codes: two related to oxygen (O2) sensors and o...

2012 Ford Focus | P0420

2005 Nissan Frontier P0420 Catalyst System Efficiency Below Threshold (Bank 1) - Dual Exhaust Modification Impact

I installed a dual exhaust system on my 2005 Nissan Frontier SE two years ago and have since experienced recurring check engine light issues. The problem is triggered by the P04...

Nissan Frontier | P0420

2009 Chrysler Town & Country P0420 Code: Causes, Diagnosis Steps, and Solutions

I own a 2009 Chrysler Town & Country with a 4.0L engine. The check engine light just came on, and the OBD2 code P042-0 has been detected. I've recently reached 100,000 miles and...

2009 Chrysler Town & Country | P0420

2005 Ford Focus P0411 and P0420 Codes: What They Mean & How to Fix Without Replacing O2 Sensors

I recently purchased a 2005 Ford Focus 'as is' three days ago. After driving it home, two check engine light codes appeared: P0411 and P0420. I looked up these diagnostic troubl...

2005 Ford Focus | P0411

2001 Town & Country 2WD 3.8L - P0455 and P0420 Codes: Evap Leak and Catalytic Converter Issues

I've been experiencing the P0455 evaporative emission system leak code for nearly a month. I replaced the gas cap, but after the replacement, the purge valve light came back on....

01 town n country 2wd 3.8 | P0420

1993 Pontiac Trans Sport 3.8L - Code P042 Issue: Intermittent Engine Death & Diagnosis Steps

My 1993 Pontiac Trans Sport with a 3.8L engine is experiencing intermittent stalling—after running for a mile or two, the vehicle suddenly dies and restarts only to stall again ...

93 Pontiac Trans Sport | P0420

2006 Chevrolet Cobalt 2.2L with P0128 and P0420 Codes: Smog Passed Without Check Engine Light

I recently passed my smog inspection on my 2006 Chevrolet Cobalt with a 2.2L engine, but two diagnostic trouble codes—P0128 and P0420—are still active. Notably, the check engine...

Chevy Cobalt | P0128

Chevrolet Camaro 6.2L 2SS Automatic - OBD2 Codes P0420 and P0430 After Installing Mufflers

Hi everyone, I recently installed long tubes and replaced all exhaust pipes with mufflers on my 201x Chevrolet Camaro 6.2L 2SS automatic. Since then, the vehicle has started tri...

chevy camaro | P0420

reduced power 2008 chevy avalanche p0420, p0430,p0106, p069e, p1682, c0035, c0561, c0899,c0900, and p0573

Having some check engine light issues and after reading about this on various sites it sounds like it can get costly and tricky.. There is a tsb where the throttle body sensor i...

2008 chevy avalanche | C0035

1998 Lincoln Navigator DTC P0420: How to Properly Diagnose and Replace the Catalyst System

I'm looking for guidance on how to properly address the DTC P0420 fault code in my 1998 Lincoln Navigator. I want to know where to start when considering replacing the catalytic...

1998 Lincoln Navigator | P0420

2003 Chevrolet Silverado Z71 1500 5.3L Engine with P0135 and P0420 Codes: O2 Sensor Issue and Catalyst Efficiency Problem

I own a 2003 Chevrolet Silverado Z71 1500 with the 5.3L V8 engine. Recently, I've been experiencing two check engine light codes: P0135 (O2 Sensor Heater Circuit Malfunction - B...

2003 Silverado Z71 1500 5.3 | P0135

2001 Pontiac Grand Am P0303 P0137 P0420 Diagnosis and Repair Guide

Hi everyone, I'm a new user here and am looking for help diagnosing issues with my 2001 Pontiac Grand Am. My engine runs roughly and feels unstable during operation. A diagnosti...

2001 Pontiac Grand Am | P0137

2005 Chevy Uplander P0420: How to Confirm Closed Loop Operation and Catalyst Efficiency

I own a 2005 Chevrolet Uplander with 110,000 miles and am experiencing a persistent P0420 catalyst efficiency fault code. I'm trying to understand whether the vehicle is operati...

2005 Chevy Uplander | P0420

P0420 Diagnostic and Fix for 1999 Honda CRV: O2 Sensor Replacement Not Enough?

I'm experiencing a recurring P0420 diagnostic code in my 1999 Honda CRV. After clearing the code, it returns within approximately 20 miles of driving. I recently replaced the ox...

1999 Honda CRV | P0420

2008 Toyota Corolla Code P0420: Catalytic Converter Performance Below Threshold?

My 2008 Toyota Corolla has triggered a P0420 diagnostic code, indicating catalytic converter performance is below the minimum threshold. According to the sensor specifications, ...

Getz | P0420

2003 Porsche 996 P0420 OBD2 Code at 15,000 Miles - Common Causes and Fixes

I own a 2003 Porsche 996 and recently received a P042-0 diagnostic code indicating a catalytic converter efficiency issue. This occurred after only 15,000 miles of driving. Is t...

2003 996 Porsche | P0420

1997 Ford F150 P0420 Fault Code: What It Means and How to Fix It

I own a 1997 Ford F150 truck and recently scanned the vehicle's diagnostic system. The code retrieved is P0420, with the Check Engine Light (CEL) illuminated. The monitor status...

1997 Ford F150 | P0420

P0420 Fault on 2001 Ford Lightning After Incorrect Muffler Installation

I own a 2001 Ford Lightning with 54,000 miles and am currently experiencing a P0420 diagnostic trouble code. Initially, the vehicle showed a P0172 code, which I have since resol...

2001 Ford Lightning | P0420

Nissan Murano P0420 Fault: What Does It Mean and How to Fix It?

When the check engine light is on and your Nissan Murano displays a P0420 diagnostic code, what does this mean? The P0420 code indicates a failure in the catalytic converter's e...

Nissan Murano | P0420