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.
P0302 and P0305 Misfire Diagnosis - 1998 Toyota Tacoma 6-Cylinder with 126K Miles
Hi everyone, I'm looking for help diagnosing a persistent misfire issue on my 1998 Toyota Tacoma with a 6-cylinder engine. The vehicle has 126,000 miles and an automatic transmi...
98 Toyota Tacoma | P0302P0452 98 GMC K1500
Comes and goes. Mostly the light stays lit. New GM Gas Cap. Replaced Fuel Pump at 150000. Where do I start? Thanks!!
98 GMC K1500 | P0452P0420, P0430, P1351 Fault Codes on 1997 Chevrolet Silverado 5.7L V8 - Diagnosis and Fixes
The fault codes P0420 (Catalyst System Efficiency Below Threshold), P0430 (Catalyst System Efficiency Below Threshold Bank 2), and P1351 (Oxygen Sensor Circuit Malfunction) on a...
97 Chevy Silverado 5.7L | P0420P0440 Evap Emissions Code, 1999 Chevy Blazer
the gas cap is tight, but i'm not sure where or if the leak is. i'm also experiencing some drivability problems, chugging and hard starting, i'm wondering about the O2 sensor, ...
1999 Chevy Blazer | P04401999 Chevrolet Suburban P0302 Code: Cylinder 2 Misfire - Diagnosis & Fixes
I'm experiencing a persistent P0302 code on my 1999 Chevrolet Suburban with a 5.7L V8 engine. I've already replaced the spark plugs, ignition wires, distributor cap, rotor, and ...
99 Suburban | P030299 Acura 3.2TL P1676 Code: FPTDR Signal Line Failure and Engine Stalling Solutions
My 1999 Acura 3.2TL is consistently showing fault code P1676, which stands for 'FPTDR Signal Line Failure'. The car occasionally stalls while driving and then fails to start — i...
99 Acura 3.2TL | P1676P0135 O2 Sensor Heater Circuit Fault - Ford Ranger Diagnosis and Fix
User reports persistent P0135 diagnostic trouble code on their 2001-2010 Ford Ranger. The issue involves the oxygen sensor heater circuit, which is critical for proper engine em...
FORD RANGER | P013597 GMC C1500 P0175 and P0137: Hard Start, Rich Running, and Fuel Leak Diagnosis
I recently experienced a hard start on my 1997 GMC C1500 after the engine had been sitting for several hours. When I restarted it immediately, there was no misfire or stumble—th...
97 GMC C1500 | P01372003 Dodge 2500 Hemi Code P2175: What Does It Mean and How to Fix It?
I own a 2003 Dodge 250
HEMI | P2175P0340 Fault in Plymouth Neon: Camshaft Position Sensor A Bank 1 Circuit Malfunction Diagnosis and Repair Cost
While driving today, my check engine light activated, followed by noticeable engine hesitation and reduced performance a few miles later. I recently replaced all spark plugs and...
Ply Neon | P0340P1131 Fault Code Explanation and Location for 2002 Mazda 626 V6 2.5L
The other day my 2002 Mazda 626 V6 2.5L triggered a P1131 diagnostic trouble code: 'HO2S Bank 1 Sensor 1 - Signal Below 0.45V (Air/Fuel Ratio Too Lean)'. I haven't noticed any d...
Mazda 626 | P1131P0444 2007 Kia Sorento 3.5L
Hey guys, i keep getting dtc po444 - evap purge valve open.have replaced the valve cleared the fault code.after about 10 min of driving keeps coming back.what else could be caus...
2007 Kia Sorento 3.5L | P04441995 Subaru Legacy AT with OBDII: P0105/P0106 Codes and MAP Sensor Testing for Pressure Exchange Solenoid
I own a 1995 Subaru Legacy with an automatic transmission and OBDII compatibility. I'm currently experiencing diagnostic trouble codes P0105 and P0106, which point to issues wit...
subaru | P0105GMC Jimmy P0101, P0173, P0174 Codes After MAF Sensor Replacement
I replaced the mass air flow (MAF) sensor about a week ago, but the check engine light returned with codes P0101, P0173, and P0176. The vehicle is showing a fuel system issue fo...
GMC Jimmy | P01012001 Town & Country EVAP System Fault: Trouble Codes P0442 and P0455 - Where Does the Rubber Hose Connect?
I recently discovered the check engine light is on, and a diagnostic scan at AutoZone revealed trouble codes P0442 and P0455. These indicate medium and large evaporative emissio...
2001 Town and Country | P0442P0430 Fault on Bank 2 - Diagnosis and Solutions for 1998 Ford Explorer V8
I own a 1998 Ford Explorer with a V8 engine and automatic transmission. I recently received a P043-0 diagnostic code indicating a problem with the catalytic converter on Bank 2....
1998 EXPLORER | P0430Practical 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.