Free OBD-II Code Lookup
OBD-II Fault Code Lookup
1,829 fault codes with symptoms, causes, solutions and repair costs
P
Powertrain
Engine, transmission and emission system
1345 codes
B
Body
Doors, windows, A/C, lighting
201 codes
C
Chassis
Brakes, ABS, ESP, suspension
146 codes
U
Network
CAN bus, ECU communication
137 codes
Categories
Engine Management
Motor kontrolü, hava/yakıt sistemi, enjeksiyon
Emission Control
Egzoz gazı, katalitik konvertör, EGR
Transmission
Otomatik/manuel şanzıman, debriyaj, vites
Body
Kapılar, camlar, klima, aydınlatma
Chassis, Brakes, Stability
ABS, ESP, frenler, süspansiyon, direksiyon
Network Communication
CAN bus, ECU iletişimi, sensör bağlantıları
Most Common Fault Codes
P0300HighRastgele/Coklu Silindir Atesleme Hatasi Tespit EdildiP0171HighSistem Cok Fakir (Banka 1)P0420HighKatalitik Konvertor Sistem Verimliligi Esik Altinda (Banka 1)P0301HighSilindir 1 Atesleme Hatasi Tespit EdildiP0172HighSistem Cok Zengin (Banka 1)P0400HighEgzoz Gazi Geri Donusumu (EGR) Akis ArizasiP0340HighEksantrik Mili Pozisyon Sensoru A Devresi Arizasi (Banka 1)P0440HighBuharlasmali Emisyon Kontrol Sistemi ArizasiP0700HighSanziman Kontrol Sistemi Ariza Tespit EdildiP0500HighArac Hiz Sensoru A ArizasiP0455HighEVAP Sistemi Kacak Tespit Edildi (Buyuk Kacak)P0442HighEVAP Sistemi Kacak Tespit Edildi (Kucuk Kacak)P0135HighO2 Sensoru Isitici Devresi Arizasi (Banka 1, Sensor 1)P0141HighO2 Sensoru Isitici Devresi Arizasi (Banka 1, Sensor 2)P0128HighSogutma Sivisi Termostati (Sogutma Sivisi Sicakligi Termostat Altinda)P0174HighSistem Cok Fakir (Banka 2)P0302HighSilindir 2 Atesleme Hatasi Tespit EdildiP0303HighSilindir 3 Atesleme Hatasi Tespit EdildiP0401HighEGR Akisi Yetersiz Tespit EdildiP0446HighEVAP Havalandirma Kontrol Devresi Arizasi
FAQ
What is an OBD-II fault code?
OBD-II (On-Board Diagnostics II) is a vehicle diagnostic system that identifies issues in engine, transmission, emission and other systems using codes starting with P, B, C, or U.
How can I read fault codes?
You can read fault codes using an OBD-II scanner or Bluetooth adapter (like ELM327) connected to your vehicle's OBD port, usually located under the steering wheel.
What if the code comes back after clearing?
A returning code means the underlying issue hasn't been fixed. Clearing codes only temporarily removes the warning. We recommend visiting a mechanic.
What do P, B, C, U codes mean?
P = Powertrain (engine & transmission), B = Body (comfort systems), C = Chassis (brakes, ABS), U = Network (CAN bus communication).