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.
1999 Malibu 3.1L Engine Multiple Fault Codes: PO101, PO131, PO137, PO300, P1133 - Diagnosis and Fixes
I plan to clean the Mass Air Flow (MAF) sensor to resolve the PO101 and P113-3 fault codes related to airflow detection. The vehicle has 120,000 miles and may still have origin...
1999 Malibu 3.1 | P1133Saturn SC 1 P0302 Misfire: Code Shows Cylinder #2 but Actual Misfire is in Cylinder #1 - Diagnosis & Fixes
I own a 1996 Saturn SC 1 with SOHC engine, 165,000 miles, manual transmission. I'm experiencing a misfire code (P0302) that appears only during idle and disappears when driving—...
Saturn SC 1 | P03022002 Chevrolet Express Van 5.7L Engine P0300 Misfire with Coolant Loss and Exhaust Steam
My 2002 Chevrolet Express Van (2500 model) with 39,000 miles is showing a recurring P0300 intermittent misfire code. Recently, I've noticed coolant loss and the vehicle runs rou...
02 chevy van 5.7 | P03002000 Grand Cherokee P0320 and P0720: Causes, Diagnosis, and Fix for Hard Starting and Engine Stalling
My 2000 Grand Cherokee with a 4.7L V8 and automatic transmission has recently started exhibiting intermittent stalling when coming to a stop. The vehicle would restart easily af...
2000 Grand Cherokee | P03201996 Ford Windstar P0171 & P0174 Trouble Codes: Causes After Intake Manifold Gasket Replacement
I own a 1996 Ford Windstar with a 3.8L engine. My OBD2 scanner is displaying trouble codes P0171 (System Too Lean Bank 1) and P0176 (System Too Lean Bank 2). These codes appeare...
1996 FORD WINDSTAR | P0171P0420 OBD2 Code on 2001 Oldsmobile Alero: Is My Catalytic Converter Really Faulty?
I recently completed an emissions test on my 2001 Oldsmobile Alero, and while the vehicle passed all emission checks, the 'Malfunction Indicator Light' (MIL) remained active. Th...
Cat | P04202001 Pontiac GP 3.8L Engine Stalls with P0101 MAF Code - Diagnosis and Solutions
I'm experiencing a recurring engine stall issue on my 2001 Pontiac GP 3.8L, specifically when driving at highway speeds (70 mph) or cruising at lower speeds (35-50 mph). The veh...
2001 Pontiac GP | P01012002 Toyota Camry 2.4L P0420 Code: How to Identify Which Catalytic Converter is Faulty
I own a 2002 Toyota Camry with a 2.4-liter engine and recently received a P0420 diagnostic trouble code indicating 'Catalyst Efficiency Below Threshold'. No other codes are pres...
2002 Toyota Camry 2.4 | P04201997 Infiniti J30 P0325, P0400, P0443 - Emission Failure After Fuel Pump Replacement
My 1997 Infiniti J30 has been failing emissions tests even after clearing the check engine light codes. My stepfather recently replaced the fuel pump using a DIY tool, but now t...
1997 Infiniti J30 | P03251998 Chevrolet Diesel P0251 and P0231 Fault: Injector Pump Fuel Metering Issue & Engine Stalling at Warm-up
I own a 1998 Chevrolet diesel and am experiencing engine stalling, particularly as the engine begins to warm up. The vehicle will start again after stalling but I've noticed a p...
98 chevrolet diesel | P02511995 Ford Windstar Van Misfiring Under Load with PO340 Code - Solutions and Diagnostics
I own a 1995 Ford Windstar van with 187,000 miles on the odometer. Approximately two weeks ago, the vehicle began displaying a PO340 diagnostic trouble code. I replaced the cam ...
1995 Windstar | P0340PO135 Diagnostic and Fix for 2004 Jeep Wrangler - Code Won't Clear
I own a 2004 Jeep with a persistent PO135 diagnostic code that won't clear, even after replacing three front manifold oxygen sensors, the thermostat, and still failing inspectio...
2004 Jeep | P01352007 Chevrolet Tahoe P0120 Code: Is Throttle Body Replacement Necessary?
My wife drives a 2007 Chevrolet Tahoe LT 4WD with 47,000 miles. It has never had any prior issues, but recently the check engine light came on. The only fault code detected is P...
2007 chevrolet tahoe | P01201996 Chrysler Voyager 3.8L Engine P0300 Random Misfire: Causes and Solutions
I own a 1996 Chrysler Grand Voyager with 257,000 miles and a 3.8L engine that has been running roughly for some time. After receiving an OBD2 code indicating a faulty oxygen sen...
1996 chrysler voyager | P0300P0172 Fault on 2001 Chrysler 300M After Head Gasket Replacement
I recently received the P0172 code (System Too Rich - Bank 1) approximately 30 miles after having my head gasket replaced by a qualified mechanic. The issue appeared shortly aft...
Chrysler 300M | P01721999 Chevy Silverado 4.3L: Resolving P0327, P0171, and P0174 Codes After Multiple Repairs
I'm back with a persistent issue on my 1999 Chevrolet Silverado 1500 4.3L V6 with automatic transmission. Since August 2008, I've replaced the MAF sensor, air filter, knock sens...
1999 Chevy Silverado | P0171Practical 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.