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.
P0172 Fault on 1995 Blazer: Diagnosis and Solutions for Rich Fuel Condition
I frequently encounter the P0172 diagnostic trouble code on my 1995 Chevrolet Blazer. The Check Engine Light appears intermittently, turning off after 3 to 5 restarts, then reap...
95 Blazer | P0172P0171 in Dodge truck
My 1996 Dodge 1500 has the "system to lean - bank 1" P0171 code. Truck has ~ 165K miles, 5.9L. I noticed some people mentioned the a MAF sensor, another post indicated a MAP se...
Dodge truck | P0171P1441 and P0171 Diagnostic for 1997 Pontiac Grand Prix After Engine Replacement
After installing a new engine in my 1997 Pontiac Grand Prix, the onboard diagnostic system is showing both fault codes P1441 and P0171. What should be the first component to ins...
Pontiac | P01711998 Chevrolet Malibu 3.1L P0401 EGR Valve Issue: No Flow Despite Power Supply
I have a 1998 Chevrolet Malibu with a 3.1L engine and a linear EGR valve. Recently, the SES light came on, and the only fault code detected was P0401 — indicating an insufficien...
98 malibu | P04012002 VW New Beetle Turbo P1296 Code: Cause and Fix - Engine Cooling System Malfunction
I own a 2002 VW New Beetle Turbo with an automatic transmission and am currently experiencing trouble code P1296. What does this code mean, and what steps should I take to resol...
VW | P1296P0741 Torque Converter Clutch Circuit Fault on 1999 Cadillac Deville - Diagnosis and Repair Cost
I'm experiencing a P0741 diagnostic trouble code on my 1999 Cadillac DeVille, which indicates a 'Torque Converter Clutch Circuit Performance or Stuck Off' issue. The service eng...
1999 Cadillac Deville | P0741p0171, p0174, p0303, p0304 1999 Ford Windstar
These four codes came up during my emissions test. One seems to indicate possibly faulty wires or compression. Is there anything specific I should look for. My larges fear i...
1999 Ford Windstar | P0171Subaru 1999 EVAP System Vent Control Fault Code P1443 Diagnosis and Fix
I own a 1999 Subaru and recently encountered fault code P1443, which corresponds to an 'EVAP system vent control function problem'. I had the code read at a local mechanic and t...
Subaru | P1443P1407 OBD2 Fault Code in 1994 Mustang with 3.8L V6 - Diagnosis and Fixes
I recently received a P140-7 diagnostic code on my 1994 Mustang equipped with a 3.8L V6 engine, totaling 157,000 miles. This code appeared previously on a Taurus vehicle, where ...
94 Mustang | P14071999 Jeep Cherokee P1391 Fault: Intermittent Crankshaft or Camshaft Position Sensor Issue & Diagnostic Tips
I'm experiencing a persistent P1391 fault on my 1999 Jeep Cherokee (2.5L 4-cylinder). The code indicates an intermittent loss of position from either the Crankshaft Position (CK...
1999 Jeep Cherokee | P13912002 Ford Ranger P0135 Code: O2 Sensor Heater Circuit (Bank 1 Sensor 1) - Diagnosis and Repair Guide
I recently purchased a 2002 Ford FX4 from eBay, which was a smart move—though I’ll never do that again. The vehicle has already required multiple repairs including front wheel b...
2002 Ranger | P0135P1401 and P0455 Diagnostic Guide for 1998 Ford Ranger 4-Cylinder
I'm new to car diagnostics and need help identifying where to start troubleshooting. I have a 1998 Ford Ranger with a 4-cylinder engine. The gas cap is the correct one and is s...
98 ford ranger | P14012000 Ford Expedition P0401 Code: Causes, Fixes & Common Solutions
My 2000 Ford Expedition with 107,000 miles is showing a P0401 fault code — EGR Flow Insufficient Detected. All original components and no major repairs have been done yet. I'm l...
2000 EXPEDITION | P0401P0440 Fault Diagnosis for 2000 Chevrolet Tracker - EVAP System Issues at 121,000 Miles
Hi there, I own a 2000 Chevrolet Tracker with 121,000 miles on the odometer. Recently, my vehicle triggered a Service Engine Soon (SES) light, and the diagnostic scan revealed c...
2000 Chev Tracker | P04401999 Dodge Durango P0505 and P0126 Diagnostic: Causes, Fixes & Common Pitfalls
I own a 1999 Dodge Durango 4x4 with a 5.9L V8 engine. The Check Engine light is on, and the diagnostic codes reading are P0505 (Idle Control System Malfunction) and P0123 (Throt...
99 Dodge Durango | P0123P1406 Fault in 1995 Blazer 4.3L Engine: EGR Valve Carbon Buildup and Noise Solutions
I'm experiencing a recurring issue with my 1995 Blazer 4.3L engine, specifically fault code P1406 related to the EGR valve. I've noticed small pieces of carbon accumulating insi...
95 Blazer 4.3 | P14061996 Ford Aspire P0340, P0110, P0140, P0400, P0170, P0300, P0470 Codes Explained - What Do They Mean and Can I Fix Them Myself?
Hi everyone, About 18 months ago, I replaced the fuel pressure regulator on my 1996 Ford Aspire. Since then, the check engine light has intermittently come back on—sometimes go...
Unknown | P0700Practical 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.