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.
P0420 Code in 2002 Ford Cougar with 4-Cylinder: Diagnosis and Solutions
I own a 2002 Ford Cougar with a 4-cylinder engine that is displaying a P0420 diagnostic trouble code. I have inspected the exhaust system thoroughly and found no visible damage....
2002 Cougar | P0420P0402 Fault with Engine Shaking in 1998 Ford Taurus: Causes and Fixes
Every day when I start my 1998 Ford Taurus, the engine shakes for a few minutes. After a short period, the engine speed increases suddenly and the shaking stops. Recently, the '...
98 ford taurus | P04021998 Mustang Cobra P1516 Fault: Intake Manifold Runner Control Input Error - How to Fix
I own a 1998 Mustang Cobra with a 4.6L 32V engine and approximately 100,000 miles on the odometer. My OBD-II scanner is showing fault code P1516, which indicates an 'Intake Mani...
98 cobra | P15162000 Dodge Stratus P0300/P0302/P0303 Misfire Diagnosis and Repair Guide
My 2000 Dodge Stratus 2.4L engine stopped while driving on the freeway. After connecting a OBD-II scanner, I'm receiving misfire codes P0300 (random/multiple cylinder misfire), ...
unknown | P030097 Cadillac DeVille PO503 Code: Brake Switch Issue and Speedometer Behavior Explained
I'm experiencing a sudden speedometer malfunction on my 1997 Cadillac DeVille. During the last drive, the speedometer started reading backwards—from 45 mph down to zero—then the...
97 cadillac deville | P05032000 Dodge Intrepid P0300 P184: Check Engine Light On During Long-Distance Driving?
I own a 2000 Dodge Intrepid with a 2.7L V6 engine. The check engine light activates only during long-distance drives (typically 2-3 hours), and the diagnostic codes displayed ar...
2000 Dodge Intrepid | P0300P0171 on '99 Ford Escort ZX2
By doing research I found out that it could possible be two things. 1.) MAF Sensor is dirty or not working. 2.) Vacuum leak downstream of the MAF Sensor. My question is, is this...
Ford Escort ZX2 | P01712001 GMC 1500 Pickup PO446 DTC: EVAP System Leak or Electrical Issue?
I recently purchased a 2001 GMC 1500 pickup and am seeing a diagnostic code PO446. My service manual indicates this code corresponds to an 'EVAP system computer output circuit' ...
GMC | P04461999 Dodge Caravan P0132, P0138, and P0172 Codes: Intermittent Stuttering, Rich Fuel Mix, and O2 Sensor Issues
I'm experiencing intermittent engine stutters and sudden smooth runs in my 1999 Dodge Caravan with a 3.3L 6-cylinder engine. The vehicle shows persistent OBD-II diagnostic codes...
99 Dodge Caravan | P0132P0451 Diagnostic and Fix for 2005 Ford Mustang - Low Fuel Economy Issue
Hi everyone, my Check Engine Light (CEL) just came on in my 2005 Ford Mustang. After using an OBD-II scanner, I retrieved the diagnostic code P0451. This code indicates a proble...
05' Mustang | P04511997 Dodge Neon (Code 11) - P1390 or P1391: Timing Belt Skipped Tooth or CMP/CKP Sensor Issue?
I have a 1997 Dodge Neon with DOHC engine. The check engine light is on, preventing me from passing the emissions test. The only stored diagnostic code is '11', which according ...
97 Neon | P13901997 Cadillac DeVille P0603 and P1604 Fault Code Diagnosis - Fuel Pressure & Engine Misfire Issues
Hi, I own a 1997 Cadillac DeVille with a 4.6L engine. The car runs smoothly under light throttle but exhibits rough running, misfires, and backfiring when under load. These symp...
97 Cadillac Deville | P0603P0171 & P0174 tried lots of things, on coming 04 Tahoe
Ive tried cleaning the MAS with CRC MAS Cleaner, Throttle Body and still keeps on returning. Truck runs fine but I'd like to fix the problem when I could find the culprit. Deale...
04 Tahoe | P01712000 Ford Ranger P0410 Code Meaning and Fix: What You Need to Know
I recently cleared the P0410 diagnostic trouble code on my 2000 Ford Ranger with a 3.0L V6 engine. As someone without extensive knowledge of automotive electronics, I'd like to ...
2000 Ford Ranger | P04101996 Toyota Tercel P0401 EGR Flow Insufficient - After Replacing EGR Valve and Modulator, Code Returns
I'm experiencing a persistent P0401 (EGR Flow Insufficient) fault code on my 1996 Toyota Tercel. Despite multiple attempts to clean the EGR valve and vacuum selector valve, and ...
96 toyota tercel | P0401P1157 Fault Diagnosis and Repair for 2003 Honda Element - O2 Sensor vs Air/Fuel Ratio Sensor Confusion
A few days ago, the engine warning light illuminated on my 2003 Honda Element. I immediately pulled over on a highway to inspect the vehicle, checking both the engine and gas ca...
Honda Element | P1157Practical 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.