Traditional gasoline car fault
Search fault code and browse forum case posts.
This page is designed for quick diagnosis on gasoline vehicles by combining code lookup with real discussion cases. Enter a fault code to filter related topics, then compare symptom context such as cold start behavior, acceleration load, fuel-trim deviation, ignition misfire pattern, and recent maintenance history. Many codes can be triggered by shared root causes, so use cross-checks from multiple posts before replacing sensors, coils, injectors, or catalytic components.
97 Ford Contour P0401 and P0402: Are These Codes Contradicting? What's Really Causing It?
I'm seeing two conflicting diagnostic codes on my 1997 Ford Contour: P0401 (EGR flow insufficient) and P0402 (EGR flow excessive). According to my OBD2 scanner, these codes appe...
97 ford contour | P0401Excessive EGR Flow Issue on Ford F-150 4.6L Engine: Diagnosis and Solutions
I've recently replaced the EGR valve, EGR sensor, and EGR regulator on my Ford F-15 T-150 with a 4.6L engine, but the vehicle still runs roughly and I'm consistently receiving t...
Ford F-150 | P04732000 Chevy Blazer P0446 Fault: Diagnosis and Engine Stalling Issues
I recently encountered the P0446 diagnostic code twice on my 2000 Chevrolet Blazer. After clearing the code and driving for several weeks, the vehicle experienced multiple stall...
2000 Chevy Blazer | P04462001 Mazda Millenia P1250 P1521 P0421 Fault Codes Not Clearing After O2 Sensor and VRIS Replacement
I own a 2001 Mazda Millenia with a 6-cylinder, non-supercharged engine. I've been consistently encountering three diagnostic trouble codes: P0421 (O2 sensor signal below thresho...
2001 Mazda Millenia | P04212005 Chevy 3500 Silverado Turbo Diesel DTC P1093: Fuel Rail Issue Diagnosis and Fixes
I'm experiencing a recurring issue with my 2005 Chevy 3500 Silverado Turbo Diesel, specifically triggering DTC P1093. The problem manifests only during hard acceleration, after ...
2005 Chevy 3500 Silverado | P1093P0303 & P0316 Diagnosis: 2005 Ford Taurus 3L DOHC V6 Durateck Misfire Fix Guide
I'm experiencing intermittent engine misfires and a flashing check engine light on my 2005 Ford Taurus with the 3.0L DOHC V6 Durateck engine. The fault codes detected are P0303 ...
2005 Ford Taurus 3L DOHC v6 Durateck | P0303Audi V6 Quattro 16 Fault Codes: P0431, P0421, P0300-P0305, P0161, P0105P, P0135, P0160P, P0105P - Diagnosis & Fix Guide
My Audi V6 Quattro has been scanned and returned 16 diagnostic trouble codes. The full list includes: - P0431: Diesel particulate filter regeneration failure (Bank 2) - P0421: ...
AUDI V6 QUATTRO | P0100P0172 Fault Diagnosis for 2005 Saturn Vue 2.2L 4-Cylinder: Sputtering on Highway, No Black Smoke
Hello everyone! I've read numerous posts about the P0172 code, but none match my exact symptoms. I own a 2005 Saturn Vue with a 2.2L 4-cylinder engine. The issue began when dr...
Saturn Vue | P01722000 Chevy Silverado 5.3L Engine P0171/P0174/P0323 Fault - Intake Gasket or Knock Sensor Issue?
Hello, I've searched extensively and haven't found a solution specific to my 2000 Chevrolet Silverado 5.3L engine with 165,000 miles. The check engine light (CEL) is currently ...
2000 Chevy Silverado | P01712005 Ford E250 4.6L V8 Running Rough and P0171 Misfire - MAF Sensor Suspected?
I'm working on a 2005 Ford E250 with a 4.6L V8 engine that is still exhibiting rough running and lean conditions, indicated by a persistent P0171 code and misfires (typically P0...
Ford e250 | P2177Jeep SRT8 P0171 and P0174 Lean Codes: Diagnosis After Major Modifications
I'm experiencing persistent lean engine codes P0171 and P0174 on my Jeep SRT8. The issue started after I reverted to a stock cat-back exhaust system. I drove the vehicle for sev...
Jeep SRT8 | P01711996 Toyota V6 Avalon OBD2 Code P0420 Troubleshooting Guide
I own a 1996 Toyota Avalon with a V6 engine, and I'm currently experiencing the P0420 diagnostic trouble code. I recently replaced the downstream oxygen sensor after the catalyt...
1996 V6 Avalon | P1996PO700 Diagnostic for 2001 Jeep Grand Cherokee 4.7L - Transmission Error Code Explanation
I'm experiencing a PO700 transmission diagnostic code on my 2001 Jeep Grand Cherokee with a 4.7L engine. The vehicle shifts smoothly, and transmission fluid level is normal. It ...
2001 Jeep Grand Cherokee | P07001999 Dodge Durango 5.2L Engine P0505 Code: Diagnosis and Solutions After Multiple IAC Replacements
I own a 1999 Dodge Durango with a 5.2L V8 engine (171,000 miles) that has been plagued by the P0505 code for over a year. I initially believed this was solely an idle air contro...
99 Dodge Durango | P05051997 Ford Contour Starting Issue After Warm-Up: P0402 EGR Flow Excessive Detected
My 1997 Ford Contour starts easily when cold, but once the engine warms up and I turn it off, it cranks but fails to start. The only fault code detected is P0402 — indicating ex...
97 ford contour | P04021998 GMC Sierra 2500 5.7L Engine P0172 and P0175 Codes - How to Fix Rich Fuel Mixtures
I own a 1998 GMC Sierra 2500 with a 5.7-liter engine and over 190,000 miles. The truck has recently triggered diagnostic trouble codes P0172 and P0175, indicating that both Bank...
gmc 2500 | P0172Dodge Ram 1997 P1389 Fault: ASD Relay Issue - Is It a Bad Relay or PCM?
My 1997 Dodge Ram won't start and the check engine light shows code P1389, indicating an issue with the Anti-Theft System (ASD) relay. I'm wondering whether this is caused by a ...
Dodge Ram 1997 | P138997 Chevy pickup 4.3 with P0300 code
I have a 97 chevy Cheyene pickup with a 4.3, automatic. It has 109,000 miles on it, and has been a very dependable vehicle. But lately has been having check engine come on it t...
97 Chevy Pickup 4.3 | P0300Practical workflow for fault-code troubleshooting
Start by confirming battery voltage and reading freeze-frame data, then inspect wiring and connectors before replacing parts. If the code returns after clearing, record the exact driving or idling condition when it reappears. Prefer case threads with complete repair feedback, because confirmed outcomes provide stronger guidance than one-time symptom descriptions. Following a step-by-step workflow reduces repeated repairs and lowers total diagnosis time.