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 Bank 1 Diagnosis and Fix: O2 Sensor Replacement for Nissan Altima GXE
If you're experiencing a P0420 (Bank 1) diagnostic trouble code on your Nissan Altima GXE, start by replacing the oxygen (O2) sensors. These components are relatively inexpensiv...
Nissan Altima GXE | P0420P0300 Fault in 2001 Chevrolet Silverado 4.8L: Multiple Random Misfires with Cylinders 4 and 5
I've recently experienced difficulty starting my 2001 Chevrolet Silverado 4.8L when the engine is cold, along with intermittent random misfires. I replaced the spark plugs and i...
01 Silverado 4.8L | P0300Random/Multiple Cylinder Misfire Detected - 2002 GMC Yukon XL Diagnosis and Solutions
2002 GMC Yukon XL 4WD The service engine light came on a few months ago. An auto parts store initially diagnosed a faulty O2 sensor, which I replaced—this resolved the issue tem...
2002 GMC Yukon XL | P0300P0146 Fault Code on 2000 Chevy S10 4.3L: Downstream O2 Sensor Issue?
We're experiencing a recurring P0146 diagnostic trouble code on our 2000 Chevrolet S10 with the 4.3L engine. We've already replaced both downstream oxygen (O2) sensors located o...
2000 Chevy S10 4.3L | P01462000 Infiniti I30 P0300 Random Misfire Code: Diagnosis and Solutions
I own a 2000 Infiniti I30 with a 3.0L V6 MFI engine, and recently the car has triggered a P0300 diagnostic code indicating a random misfire. The vehicle was recently tuned up, a...
2000 Infiniti I30 | P03002000 Ford Windstar P0172 Code: Diagnosis and Solutions with P0153 and P1132 Codes
Hi everyone, I'm currently troubleshooting a 2000 Ford Windstar that has been displaying the P0172 code (System Too Rich Bank 2) along with intermittent P0153 and P1132 codes. ...
2000 Windstar | P01722001 BMW 325CI P0128 Fault: Diagnosis and Fix Guide
Hello, I own a 2001 BMW 325CI with a 2.5-liter engine. Recently, the P0128 diagnostic trouble code appeared and has returned after being reset. The coolant temperature gauge rea...
2001 BMW | P01282004 Nissan Patrol Diesel P3-Pump COM Line Fault Code: Engine Dies While Driving, Restartable
Hi everyone, I'm having an issue with my 2004 Australian model Nissan Patrol Diesel. The vehicle displays a P3-Pump COM LINE fault code and intermittently cuts out while driving...
2004 Nissan Patrol Diesel | P3000Late 2000 Suburban 1500: PO758 Code, Transmission Stuck in 2nd/3rd Gear, and Instrument Cluster Failure
My 2000 Chevrolet Suburban 1500 developed a series of unexpected issues over the weekend. While driving, all gauges—including the tachometer, speedometer, odometer, gear indicat...
Unknown | P0758Pathfinder Fuel Filler Tube Corrosion Recall and P0171 Code: Are They Related?
In winter states that use road salt, a mixture of snow, water, and salt can cause corrosion on the bare metal section of the fuel filler tube, potentially leading to fuel leaks....
Fuel filler tube | P0171BMW 750il 1997 - How to Fix OBD2 Code P1166 and Pass Smog Inspection
I'm currently receiving OBD2 diagnostic code P1166 on my 1997 BMW 750il. This code indicates a malfunction in the oxygen sensor for bank 1, sensor 2 (post-catalyst). I cannot pa...
1997 BMW 750il | P1166P0141 and P0300 Fault Codes on 1997 GMC Safari Van with 79,000 Miles
I have a 1997 GMC Safari van with 79,000 miles and a 5.7L engine. The vehicle is currently displaying both fault codes P0141 and P0300. I'm seeking advice on how to diagnose and...
1997 GMC Savanna Van | P0141P0302 Diagnostic and Fix for 1998 Mercury Mystique - DIY Guide
Hello everyone, My wife's 1998 Mercury Mystique (4-cylinder, automatic, 105,000 miles) has a check engine light and a P0302 diagnostic code indicating a misfire in cylinder #2....
98 Mercury Mystique | P0302P1351 Diagnostic Help for 1999 GMC Yukon 5.7L Engine - How to Fix Ignition Control Circuit Voltage High Code
I'm experiencing a P1351 diagnostic code on my 1999 GMC Yukon with a 5.7L V8 engine. The code indicates 'ignition control circuit voltage high,' and I'm looking for clear, pract...
1999 GMC Yukon | P1351P0403 OBD2 Code in Subaru Engine Swap: EGR System Missing but ECU Still Detects Fault
I recently performed an engine swap on a 1996 Subaru Legacy L, replacing its engine with the one from a 1997 Subaru Brighton. The key details are: - Car 1 (1996 Legacy L): Orig...
Subaru | P0403Practical 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.