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.
Just bought a Grand Cherokee with P0300 P0301 P0302...egads!
First of all, this site rocks! Now for the unpleasantness... I just bought a one owner 2001 Jeep Grand Cherokee Limited with 77,000 miles for my fiancee, and in less than 20 mil...
Grand Cherokee | P03001996 Chevy 1500 P1406 P0101 P0102 Fault Diagnosis: EGR Valve Issues & MAF Code Causes
I own a 1996 Chevrolet 1500 with 150,000 miles and am currently experiencing the following OBD-II diagnostic codes: P1406, P0101, and P0102. I recently installed a used EGR valv...
1996 Chevy 1500 | P0101PO420 Fault on 1998 Honda Accord 2.2L EX: Aftermarket Cat Replacement Dilemma
Installed a new Walker aftermarket catalytic converter in February, direct fit model. Recently the vehicle triggered a PO420 code (Catalyst System Efficiency Below Threshold). A...
98 Accord 2.2 EX | P04202002 Jeep Grand Cherokee P0051 P0141 P0152 P0155 P0161 - Oxygen Sensor Faults: Common Wiring Issue or Individual Sensor Failure?
Dear community, My father drives a 2002 Jeep Grand Cherokee with a 4.7L V8 engine (70,000 miles) and recently triggered the following OBD-II diagnostic trouble codes: - P0051 -...
2002 Jeep Grand Cherokee | P00511997 Ford Ranger P0171 P0301 P0304 - Misfire at Idle and Low RPM, Spark Check Confirmed
My 1997 Ford Ranger is exhibiting a misfire issue that worsens during gear shifts when engine RPMs drop. The truck runs smoothly on the highway but misses significantly at idle....
1997 ford ranger | P0171P0440 Diagnostic and Repair Guide for 2001 Chevrolet Express 1500 6Cyl 4.3L - Where to Find EVAP System Parts
I own a 2001 Chevrolet Express 1500 with a 6-cylinder, 4.3L engine and am currently experiencing a P044 T code (Evaporative Emission System Malfunction). The emissions technicia...
Chevy 1500 Express VAN 6.4L | P04402003 Dodge Ram 1500 P0138 and P0585 Code Help: MIL Light On, No Resolution After Gas Cap Check
I recently purchased a 2003 Dodge Ram 1500 in July and have very limited knowledge about vehicle mechanics. Last week, the Malfunction Indicator Lamp (MIL) came on, so I asked m...
2003 Dodge Ram | P0138Mazda 626 1999 - Persistent P0421 and P0171 Codes After EGR Cleaning and Vacuum Leak Repair
Hi everyone, I own a 1999 Mazda 626 and recently encountered the OBD2 diagnostic code P0171 (Rich Fuel Mix - Bank 1). I took it to Sears Auto Shop, where they performed several...
Mazda 626 | P01712005 Jeep Wrangler 4.0L P0016 Code: Cam & Crank Sensor Sync Issue and Stutter at 350-4000 RPM
My 2005 Jeep Wrangler with a 4.0L engine and automatic transmission is displaying the P0016 diagnostic trouble code. The code indicates a mismatch between the camshaft position ...
05 Jeep Wrangler 4.0L | P0016P1404 Fault Code in 2001 Buick 3.1L: EGR System Diagnosis and PCM Wiring Issues
Hi there, I'm experiencing a persistent P1404 diagnostic trouble code on my 2001 Buick 3.1L engine. I've already replaced the EGR valve and cleaned both the throttle body and th...
2001 BUICK 3.1L | P14042000 Isuzu Rodeo 3.2L V6 DOHC P0300 Code: Rough Idle, Coil Pack Issue & Timing Belt Installation Fix
I recently replaced the cylinder heads on my 2000 Isuzu Rodeo due to camshaft locking issues. After head replacement, I performed a timing belt and spark plug replacement as rou...
2000 Isuzu Rodeo | P0300P0172 Fault After Timing Belt Replacement on 1996 Dodge Intrepid 3.5L
I own a 1996 Dodge Intrepid with a 3.5L engine. I recently completed the replacement of both the timing belt and water pump. Since the work was finished, the vehicle has started...
96 Intrepid | P01722000 Ford Ranger 3.0L Flex-Fuel with P0400: EGR Flow Insufficient - What Does '01/01' Mean and How to Fix?
Hi everyone, I recently scanned my 2000 Ford Ranger 3.0L flex-fuel engine using a generic OBD-II scanner, which returned the diagnostic trouble code (DTC) P0401 — indicating 'E...
2000 Ford Ranger | P0401Mazda P0300 Code: Causes, Symptoms, and Fixes for Misfire in 99 Mazda Millenia 2.5L
Can a faulty TPS (Throttle Position Sensor) cause a P0300 misfire code? My car exhibits hesitation when accelerating or decelerating, especially during transitions between gears...
mazda | P0300P0137 Fault Code - 1997 Blazer 4x4 4.3L Vortec Engine Diagnosis
First time posting here, hoping for some expert advice. I recently received a P0140 diagnostic code, so I replaced the oxygen sensor located before the catalytic converter. Afte...
97 Blazer 4X4 4.3 vortec | P0137Practical 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.