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.
How to Fix P1195 Error Code on 1997 Mazda Protege: Causes, Diagnosis & Solutions
I recently replaced the Powertrain Control Module (PCM) in my 1997 Mazda Protege, and all error codes disappeared except for P1195. I'm not a professional mechanic, but I've don...
1997 Mazda Protege | P1195P0420/P0420pd Code on 1997 GMC Jimmy After Engine and Transmission Replacement - What's Causing It?
Hi there, I recently purchased a 1997 GMC Jimmy with a history of mechanical issues. Originally, the transmission needed replacement due to a shifting problem between 2nd and 3...
Unknown | P04201996 Jeep Grand Cherokee P0711 P0743 P0748 P0753 P0133 - Check Engine Light On, Transmission & O2 Sensor Codes
My 1996 Jeep Grand Cherokee (Loredo 8-cylinder) recently triggered the check engine light. After taking it to Auto Zone for diagnostics, I received the following trouble codes: ...
1996 Jeep Grand Cherokee | P01332001 BMW X5 OBD Code P0560: Voltage Malfunction Diagnosis & Solutions
Hi everyone, I'm looking for reliable information about OBD code P0560 on my 2001 BMW X5. The code indicates a voltage malfunction in the powertrain system. While I believe this...
2001 BMW X5 | P05601997 Mazda Protege P0134 Code: Is It Really a PCM Failure? Diagnosis & Repair Guide
Hi everyone, I'm a mechanic's daughter and a machinist by trade. My 1997 Mazda Protege won't pass emissions tests due to a persistent P0134 code. My dad has already replaced th...
1997 Mazda Protege | P01342002 Chevy Cavalier Z24 P0300: Engine Sputters, Loss of Power, Smoke and Wet Spark Plugs - Diagnosis and Fix
I own a 2001 Chevrolet Cavalier Z24 with a 2002 Z24 engine. While driving, I noticed the RPMs fluctuating significantly at a stoplight—rising and then dropping unexpectedly. As ...
2002 Chevy Cavalier z24 | P03002001 Chrysler Concorde 69,500 mi - P0300 & P0305 Codes Lead to Engine Failure: Was It Coolant or Bad Coil?
My 2001 Chrysler Concorde (69,500 miles) started showing a check engine light while driving. The car was running normally until I turned a corner, when it hesitated and the warn...
2001 Chrysler Concorde | P03002001 Pontiac Grand Prix P0420 Error After Installing MagnaFlow Cat Converter
My 2001 Pontiac Grand Prix has reached 98,000 miles and is currently showing a P0420 diagnostic trouble code. I recently replaced the catalytic converter with a MagnaFlow unit, ...
Pontiac Grand Prix | P0420Honda Odyssey 2000 P0401 Code: Causes, Fixes, and EGR Valve Replacement Tips
I received a P0401 diagnostic code on my 2000 Honda Odyssey on November 26. I replaced the EGR valve and cleared the code, but it returned shortly after. What could be causing t...
Honda Odyssey | P04012000 Mercury Sable Cylinder 4 Misfire: How to Identify and Fix Without Replacing All Wiring
I recently started experiencing a flashing check engine light on my 2000 Mercury Sable, which the diagnostic scan revealed as a cylinder 4 misfire. I've already replaced the spa...
2000 Mercury Sable | P03041999 Ford Explorer P0171/P0174 Codes: Fuel Pump Cycling Issue & Diagnosis
I'm experiencing intermittent starting issues with my 1999 Ford Explorer (4.0L V6). The vehicle consistently shows P0171 and P0174 diagnostic trouble codes, indicating a lean ai...
1999 Ford Explorer | P01711998 Ford E-250 4.2L Engine: P1506, P1537, P1131, P1151, P0340, P0171, P0174 - Troubleshooting Guide
My 1998 Ford E-250 with a 4.2L engine is experiencing a very rough idle that cycles between low and normal RPMs. The vehicle occasionally stalls or nearly shuts off during idlin...
1998 E-250 | P0171P0420, P0400 and P0303 on 1999 Mistubishi Gallant ES
The Mitsubishi Gallant ES has 262,000 miles on it. Been getting the P0420 catalyst efficiency below threshold for about a year, year and a half. I know that's due to burning o...
1999 Mitsubishi Galant ES | P0303P0131 and P0151 OBD2 Codes on 1997 Chevrolet Tahoe - Fuel Volume Issue Diagnosis
I'm experiencing a recurring engine issue on my 1997 Chevrolet Tahoe with P0131 and P0151 diagnostic trouble codes. The engine runs smoothly at idle but dies and backfires when ...
97 Tahoe | P0131P0420 Fault on 1999 Chevrolet Camaro V6: Causes and Warranty Coverage
I recently received a P0420 diagnostic code on my 1999 Chevrolet Camaro with a 6-cylinder engine. The code appeared just a few days ago, and while the car still runs smoothly wi...
'99 Camaro v6 | P0420P0038 Fault Diagnosis and Fix for 2005 Dodge Grand Caravan - O2 Sensor Heater Circuit Issue
I'm experiencing a P0038 diagnostic code on my 2005 Dodge Grand Caravan. This vehicle has only undergone routine oil changes, with no prior mechanical work. My next scheduled in...
2005 Grand Caravan | P00382005 PT Cruiser Won't Start with P0301 Code - Fuel Pressure and Timing Belt Concerns
My wife's 2005 PT Cruiser has been sitting for a week after a camping trip. When we tried to start it, the car won't crank properly despite showing a P0301 diagnostic code. The ...
05 PT Cruiser | P0301Subaru Legacy 2002 Petrol P0130 Fault: O2 Sensor Bank 1 Circuit Malfunction Diagnosis and Repair Cost Advice
I'm experiencing a P0130 diagnostic code on my 2002 Subaru Legacy petrol engine. The error indicates a malfunction in the Heat Oxygen Sensor (HO2S) for Bank 1. Common causes inc...
Subaru Legacy | P01301999 Jeep Cherokee Sport P0138 and P0455: Related EVAP Leak and O2 Sensor Issue?
I have a 1999 Jeep Cherokee Sport with approximately 115,000 miles. It has generally run well until recently. The check engine light came on, and after scanning at AutoZone, the...
1999 Jeep Cherokee Sport | P0138Practical 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.