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.
1996 Mustang GT: P0136 and P0156 O2 Sensor Fault - Downstream Sensors Explained
Hello everyone, my 1996 Mustang GT has recently triggered the Check Engine light. The diagnostic codes retrieved are P0136 (O2 sensor circuit bank 1 sensor 2) and P0156 (O2 sens...
96 Mustang GT | P01362005-2010 Mustang 3.8L V6 P0171 Code: Causes, Fixes & DIY Solutions
I own a 2005-2010 Mustang with a 3.8L V6 engine and recently received a check engine light. The diagnostic scan shows fault code P0171 — indicating a lean air-fuel mixture in th...
Mustang | P01712000 VW Golf 4 2.0L Engine Codes P0300, P0301, P0302 and P1240 - RPM Stalls on Acceleration
Hi everyone, I'm having trouble with my 2000 VW Golf 4 (2.0L engine, 82,000 miles). The vehicle is throwing four diagnostic codes: P0300, P0301, P0302, and P1240. I've already r...
2000 vw golf | P03001999 GMC Suburban P0102 Code: What Does 'Mass or Volume Circuit Low Input' Mean and How to Test MAF Sensor?
I own a 1999 GMC Suburban with a persistent P0102 diagnostic trouble code. The error message 'mass or volume circuit low input' is confusing — what does it actually mean? Severa...
99 gmc suburban | P010203 Dodge Caravan w/ P0442 and P0455 codes
I have a 2003 caravan that I purchased used and found out it is out of warranty as of April 1... isn't that always the case. It has just over 29,000 miles. The check engine lig...
03 Dodge Caravan | P0442PO 174 Code on 1998 Ford Expedition 4.6L: Causes, Diagnosis & Fixes
I own a 1998 Ford Expedition with 105,000 miles that has recently triggered the PO 174 diagnostic code (System Too Lean Bank 2). I cleared the code, but it returned within a few...
98 Expedition | P01741999 Pontiac Trans Am P0410, P0412, P0418 Fault Diagnosis and Fix
My Check Engine light has recently come on, and I'm now receiving persistent fault codes P0410, P0412, and P0418. I've cleared the codes using an OBD2 scanner, but they reappear...
99 Pontiac Trans Am | P041099 Dodge Caravan - P0132, P0138, P0172....
I have a 99 Dodge Caravan Sport van, 3.3 L about 80K miles and I can't seem to shake the O2 codes. The engine is definitely running rich.. it smells bad...! It idles very rich (...
99 Dodge Caravan | P0132Ford Expedition 98 - Help with P0135, P0455, and P0401 OBD2 Codes
I own a 1998 Ford Expedition. The engine was previously driven for 190,000 miles on the old unit. Now I'm experiencing check engine light issues with three diagnostic trouble co...
98 Exp | P0135P0401 EGR Fault on 1998 Mercury Sable 24V: Diagnosis and Fix Guide
I'm encountering OBD-II diagnostic code P0401, which indicates insufficient EGR flow on my 1998 Mercury Sable with a 24V engine. I've already replaced the oxygen sensors, as tha...
1998 Mercury Sable 24V | P0401P0171 and P0174 Fault Codes on 2001 Cadillac Deville - Lean Mixtures and Idle Issues
I recently received check engine light activation accompanied by OBD-II fault codes P0171 and P0174 on my 2001 Cadillac Deville. The car has 62-000 miles on the odometer. I had ...
2001 Cadillac Deville | P01711996 Mustang GT 4.6L V8 P1443 Code: EVAP Emission Control System Control Valve Malfunction
Can anyone explain what the 'EVAP Emission Control System Control Valve Malf' error means? I recently received a P1443 diagnostic code on my 1996 Mustang GT with a 4.6L V8 engin...
1996 Mustang | P14431998 Grand Prix GT Stalling with P0336 and P0302 Codes - How to Fix?
I own a 1998 Grand Prix GT with a 3.8L engine. The vehicle frequently stalls while driving—sometimes it dies completely, other times it just hesitates. When it does die, the eng...
1998 Grand Prix | P0302P0401 on 96 grand prix
I'm having trouble with a code p0401.....EGR flow insufficient on my 96 grand prix. I cleaned the intake and changed the EGR valve, but it still comes on . I'm hoping someone mi...
96 Grand Prix | P0401Practical 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.