P Codes
P0100
Air Fuel Metering
1st year of OBD
1996
PCV
Positive Crankcase Ventilation
O2 sensor
Varies from .1 to .9 volts / 100 to 900 MV
What does it mean if an engine is running lean
Too much air
P0200
Air Fuel Metering
Year all models required Catalytic Converters
1975
EGR
Exhaust Gas Recirculation
MAF
size of engine at idle
What does it mean if an engine is running rich
Too much fuel
P0300
Misfire
All models required to have a PCV Valve
1964
SAI
Secondary Air Injection
Compression
What is stochiometric fuel ratio
14:1--- 14 parts of air to 1 part of fuel
P0A00
Hybrid EV
Year that most vehicles auto fill on Scan Tools
2005 and newer
VVT
Variable valve timing
Fuel pressure on port injection
30 to 60 psi
What happens when a engine is running so rich that it is damaging the Catalytic Converter
Check engine light flashes
P0600
PCM/ECU Issue
What year did all manufactures require a check engine light
1996
WOT
Wide open throttle
Fuel Pressure on Direct Injection engine
Varies from 500 to 2900 psi
What is a good fuel trim reading
0