Traditional gasoline car fault

98 Blazer 4x4 4.3L Engine Fault: Code P0404 & P0420 Diagnosis and Solutions

I've completed extensive maintenance on my 1998 Blazer 4x4 with a 4.3L engine, including vacuum checks, new tune-up, air filters, intake manifold gaskets, and today replaced the...

Blazer 4x4 | P0404

2007 Dodge Caravan 3.8L P0420 Code: Aftermarket Converter Causes Repeated DTC - Diagnosis & Fix

I'm a fleet mechanic in Houston, TX, and I've been working on a 2007 Dodge Caravan 3.8L that's consistently throwing a P0420 diagnostic trouble code (DTC). The vehicle is used p...

2007 Dodge Carvan | P0420

2002 Chevrolet Suburban P0420 Code Still Present After Catalytic Converter Replacement

We own a 2002 Chevrolet Suburban 1500 that we purchased used about a year ago. The vehicle recently triggered a P0420 and P0420PD diagnostic trouble code (DTC). Initially, the e...

2002 Chevy Suburban | P0420

1996 gmc safari p0420 p0300 po131 p0151 p0172 decel misfire

And as well if your fuel pressure still bleeds off like that then you've got a leaking injector or fuel pressure regulator! It's called the fuel spider by some and it's a su...

1996 gmc safari | P0151

2003 Buick Lesabre P0420 and P0440 Codes: Can a Neighbor Mechanic Fix It? Cost & Solutions

I own a 2003 Buick Lesabre with 140,000 miles and recently received both P0420 (Catalyst System Efficiency Below Threshold) and P0440 (Evaporative Emission System Malfunction) d...

Buick | P0420

2003 Honda CRV P0420 Fault: Catalytic Converter Issue and Engine Hesitation Symptoms

Hello, I own a 2003 Honda CRV with the i-Tech 2.4L DOHC engine. Over the past few months, my check engine light has been flashing on and off. When I had a friend scan the vehicl...

2003 Honda CRV | P0420

2001 Toyota Corolla P0420 OBD Code: Is It a Serious Issue or Just a Faulty Oxygen Sensor?

Hello, I'm looking to sell my 2001 Toyota Corolla, but the check engine light has come back on with a persistent P0420 OBD code. To be transparent with potential buyers, I'd li...

2001 Toyota Corolla | P0420

How to Test EGR Solenoid on 1999 Nissan Sentra Using OBDII via ELM327

Does anyone know the specific OBDII command needed to activate or deactivate the EGR solenoid on a 1999 Nissan Sentra? I'm currently using an ELMS327-based OBDII reader and am f...

nissan sentra | P0400

P0420 Diagnostic and Fix for 2003 Chevy S10 4-Cylinder

I own a 2003 Chevrolet S10 with a 4-cylinder engine. Recently, I replaced the catalytic converter, throttle position sensor, fuel filter, and cylinders 2 and 3 spark coils. Thes...

Chevy S10 | P0420

How to Fix P0420 Code on 2004 Subaru Outback with California Emissions Package?

I own a 2004 Subaru Outback 2.5L SOHC engine with an automatic transmission and the California emissions package, which includes a specialized catalytic converter and emission-s...

2004 subaru | P0420

P0420 Fault on 2002 Nissan Frontier XE 4-Cylinder 2WD Manual Transmission - After Catalytic Converter and O2 Sensor Replacement

The P0420 diagnostic trouble code has persisted since my catalytic converter, both oxygen sensors, and spark plugs were replaced approximately 5 months ago (about 5,000 miles). ...

Nissan Frontier 2002 XE 4cyl 2wd Manual trans | P0420

2004 Ford Ranger 4.0L V6 P0420 and P0430 Fault: Causes, Fixes, and Solutions

I own a 2004 Ford Ranger XLT with a 4.0L V6 engine and have reached 185,000 miles. Recently, the check engine light activated, displaying diagnostic codes P0420 and P0430. The t...

2004 Ford Ranger | P0420

P0420 Fault in 1999 Honda Civic LX After Distributor Replacement

I recently owned a 1999 Honda Civic LX, and about two weeks ago, my distributor failed. After the mechanic replaced it and I drove approximately 20 miles, the Check Engine Light...

99 Honda Civic LX | P0420

P0420 Fault on 2001 Chevrolet Cavalier 2.2L - Diagnosis and Next Steps

Hi, I own a 2001 Chevrolet Cavalier with a 2.2L engine, automatic transmission, and currently at 109,000 miles. A few months ago, I experienced a random misfire (likely P0300) a...

2001 Chev Cavalier 2.2 | P0420

P0420 Fault Diagnosis for 2000 Mercury Cougar V6 - Catalyst System Efficiency Below Threshold Bank 1

My 2000 Mercury Cougar V6 has the check engine light illuminated, and my OBD-II scanner displays fault code P0420 (Catalyst System Efficiency Below Threshold - Bank 1). I am con...

2000 Mercury Cougar | P0420

2003 Ford Mustang Mach 1 P0301 P0303 P0305 P0420 P0430 Diagnosis and Repair Guide

Seeking help with recurring misfire and catalytic converter issues on a 2003 Ford Mustang Mach 1 4.6L DOHC V8 engine. Fault codes detected: - P0301: Cylinder 1 Misfire Detected...

2003 Mustang Mach 1 | P0301