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.
PO301 Fault Code on 1999 Ford Taurus 3.0L Engine: Diagnosis and Solutions
I own a 1999 Ford Taurus with a 3.0L engine and have been consistently encountering the PO301 diagnostic trouble code. I've already replaced the spark plugs, plug wires, coil pa...
1999 Ford Taurus 3.0L | P03012004 Nissan Sentra P0420 P0731 P0732 Fault Codes - Car Runs Poorly with Stalling and Shaking
My son's 2004 Nissan Sentra Limited Edition (1.8L engine, automatic transmission) is showing three diagnostic trouble codes: P0420, P0731, and P073-32. The car starts and runs b...
2004 Nissan Sentra | P0420P1633 Fault Code on 2001 Ford Taurus SEL 3.0L V6: Diagnosis and Solutions
I recently received a P1633 diagnostic code on my 2001 Ford Taurus SEL with approximately 99,000 miles. Before this code appeared, the A/C clutch was making severe rattling nois...
2001 Ford Taurus SEL 3.0L V-6 | P1633Ford Taurus P0171 and P0174 Codes: Symptoms, Causes, and Diagnostics Explained
My Ford Taurus has recently returned diagnostic codes P0171 (Rich Mix Bank 1) and P0174 (Rich Mix Bank 2). These codes appeared after a routine check-up, though the vehicle has ...
Ford Taurus | P01712000 Honda Accord SE Check Engine Light with P1486 Code: Thermostat or ECM Issue?
Hello, My 2000 Honda Accord SE has been showing a Check Engine Light (CEL) this morning. The OBD-II diagnostic code retrieved is P1486. Initially, I assumed this was related t...
2000 Accord SE | P14862003 Chevrolet Cavalier P0172 and P0622 Codes: Won't Start, Fuel Trim Rich, Generator Circuit Issue
My 2003 Chevrolet Cavalier (2.2L 4-cylinder ECOTEC engine with dual overhead cam) will crank but won't start. The onboard diagnostic system is showing two error codes: P0172 - F...
2003 Chevy Cavalier | P0172P0420 Fault on 1997 Toyota Camry LE 4-Cylinder: Exhaust Leak or Catalytic Converter Issue?
I recently experienced a recurring P0420 diagnostic trouble code on my 1997 Toyota Camry LE with a 4-cylinder engine. Both oxygen sensors (O2) were replaced four months ago, but...
97 Toyota Camry LE 4 cyl | P0420P1491 Fault Code on 2001 Nissan Sentra: Vacuum Cut Valve Bypass Issue
Hello, I recently checked my 2001 Nissan Sentra at Autozone and received a diagnostic code P1491. After replacing the knock sensor, this error code has reappeared. According to ...
2001 Nissan Sentra | P1491DTC P0122 Fix for 1998 Chevrolet C3500 7.4L Gas Truck - TPS Circuit Low Input Solution
Looking for a reliable solution to DTC P0122 (Throttle Position Sensor / Switch A Circuit - Low Input) on my 1998 Chevrolet C3500 7.4L gasoline truck. Has anyone successfully re...
Chevy 1998 C3500 | P012298 Pontiac Grand Am GT 2.4L DOHC: P0113 & P0118 Codes, Poor Idle, Smoke and Running Rich - What's Causing This?
I'm not a mechanic, so I'm reaching out for help with my girlfriend's 1998 Pontiac Grand Am GT (2.4L 4-cylinder DOHC). The check engine light came on, and using a code reader, w...
Girlfriends car | P0113PO420 Catalyst Efficiency Below Threshold on 2002 Toyota Corolla: A/C Usage and O2 Sensor Diagnostics
I own a 2002 Toyota Corolla (new shape) and recently the engine management light came on. After connecting my laptop to the OBDII port, I received the error code PO420 — Catalys...
Corolla | P04201997 Ford Taurus DTC P0133, P0420, and P0430 - Upstream O2 Sensor Fix Success
I recently encountered DTC codes P0133, P0420, and P0430 on my 1997 Ford Taurus. The vehicle had a relatively new catalytic converter installed, but the P0430 code persisted. Af...
97 Taurus | P01332002 Buick Centry Check Engine Light Codes 0131, 0135, 0171 - Solutions and Diagnosis
Hi, I recently purchased a 2002 Buick Centry from my father. The vehicle previously had its catalytic converter (cat) and oxygen (O2) sensors replaced before the issue arose. Cu...
2002 Buick Century | P01311998 Honda Accord V6 Auto: P1706 Transmission Control Malfunction - What Does It Mean?
My 1998 Honda Accord EX-V6 with automatic transmission has the check engine light on. The code reader displays 'P1706 - Transmission Control Malfunction'. This fault is often li...
98 Honda Accord | P1706OBD Code 06B7 on Subaru STI 2002: Troubleshooting Guide for Preparatory Diagnostic Codes
Hello, I recently received OBD diagnostic code 06B7 from my Subaru STI 2002's ECU, which appeared after the check engine light (OBD light) came on. The vehicle has undergone re...
Subaru Sti | P0010P0304 Fault on 1999 Ford Ranger 4-Cylinder: Diagnosis and Solutions
I recently replaced all four spark plugs, ignition wires, and coils. I also cleaned the intake manifold and fuel system components, yet the P0304 misfire code persists. The engi...
99 Ford Ranger 4-cylinder | P0304Practical 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.