$ diagnose --car
Scanning DTCs... P0420 detected.
DIY fix found. Estimated savings: $847
Diagnose It Yourself.
Fix It Yourself.
Save Thousands.
Look up any OBD2 code, find common problems for your vehicle, and get step-by-step DIY fix guides. Free, always.
Top 10 Fixes That Save $500+ at the Mechanic
These are the repairs most people overpay for. Download the free guide.
✓ Check your email!
No spam. Unsubscribe anytime.
Browse by Make
Toyota
10 models
Honda
9 models
Ford
10 models
Chevrolet
10 models
Nissan
10 models
Jeep
6 models
Dodge
6 models
BMW
8 models
Mercedes-Benz
8 models
Volkswagen
8 models
Subaru
8 models
Hyundai
8 models
Kia
8 models
GMC
6 models
Ram
4 models
Mazda
7 models
Audi
7 models
Lexus
8 models
Buick
5 models
Chrysler
4 models
Most Searched OBD2 Codes
P0100
P0100 - Air/Fuel Metering System Fault
DIY: $50-$200
P0101
Mass Air Flow (MAF) Sensor Circuit Range/Performance
DIY: $10-$120
P0102
P0102 - Air/Fuel Metering System Fault
DIY: $50-$200
P0103
P0103 - Air/Fuel Metering System Fault
DIY: $50-$200
P0110
P0110 - Air/Fuel Metering System Fault
DIY: $15-$50
P0111
P0111 - Air/Fuel Metering System Fault
DIY: $15-$50
P0112
P0112 - Air/Fuel Metering System Fault
DIY: $15-$50
P0113
P0113 - Air/Fuel Metering System Fault
DIY: $15-$50
P0116
P0116 - Air/Fuel Metering System Fault
DIY: $50-$200
P0117
P0117 - Air/Fuel Metering System Fault
DIY: $50-$200
P0118
P0118 - Air/Fuel Metering System Fault
DIY: $50-$200
P0120
P0120 - Air/Fuel Metering System Fault
DIY: $50-$200
P0121
P0121 - Air/Fuel Metering System Fault
DIY: $50-$200
P0122
P0122 - Air/Fuel Metering System Fault
DIY: $50-$200
P0123
P0123 - Air/Fuel Metering System Fault
DIY: $50-$200
P0128
Coolant Temperature Below Thermostat Regulating Tempera...
DIY: $10-$40
P0130
P0130 - Air/Fuel Metering System Fault
DIY: $50-$200
P0131
P0131 - Air/Fuel Metering System Fault
DIY: $50-$200
P0132
P0132 - Air/Fuel Metering System Fault
DIY: $50-$200
P0133
P0133 - Air/Fuel Metering System Fault
DIY: $50-$200
View All OBD2 Codes →
How It Works
01
Plug In Your Scanner
A basic OBD2 scanner costs $20-40 and reads every code your car stores. Or find a free scan at AutoZone.
02
Look Up Your Code
Search any P, B, C, or U code. Get plain-English explanations, causes ranked by likelihood, and fix steps.
03
Follow the Fix Guide
Step-by-step DIY instructions with tool lists, cost breakdowns, and when to call a mechanic instead.