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Toyota Tundra. Manual - part 1146
(bank 1 sensor 1)
Integration relay
(A/F relay)
A/F sensor heater
circuits
PCV valve and
hose
PCV hose
connections
ECM
P0172
System Too Rich
(Bank 1)
Injector leakage
or blockage
MAF meter
ECT sensor
Ignition system
Fuel pressure
Gas leakage from
exhaust system
Open or short in
A/F sensor(bank
1 sensor 1)
circuit
A/F sensor (bank
1 sensor 1)
A/F sensor heater
(bank 1 sensor 1)
Integration relay
(A/F relay)
A/F sensor heater
circuits
ECM
Comes on
DTC Stored
P0174
System Too Lean
(Bank 2)
Air induction
system
Injector blockage
Mass Air Flow
(MAF) meter
Engine Coolant
Temperature
(ECT) sensor
Fuel pressure
Gas leakage from
Comes on
DTC Stored
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra