P1400
DPFE Sensor Low Voltage (Mazda)
P1400
DPFE Sensor Low Voltage (Ford)
P1401
DPFE Sensor High Voltage (Mazda)
P1401
DPFE Sensor High Voltage (Ford)
P1403
DPFE Hoses Reversed (Mazda)
P1403
No 5 Volts To EGR Sensor (Chrysler)
P1404
Exhaust Gas Recirculation (EGR) Valve Pintle Stuck Open
P1405
DPFE Upstream Hose Off Or Plugged (Mazda)
P1405
DPFE Upstream Hose Off Or Plugged (Ford)
P1406
DPFE Downstream Hose Off Or Plugged (Mazda)
P1406
DPFE Downstream Hose Off Or Plugged (Ford)
P1407
EGR No Flow Detected (Mazda)
P1408
EGR Out Of Self Test Range (Mazda)
P1408
EGR Out Of Self Test Range (Ford)
P1409
Electronic Vacuum Regulator Control Circuit Malfunction (Mazda)
P1409
EGR Vacuum Regulator Solenoid Circuit Malfunction (Ford)
P1411
Secondary Air Injection System Downstream Flow (Ford)
P1413
Secondary Air Injection System Monitor Circuit Low (Ford)
P1414
Secondary Air Injection System Monitor Circuit High (Ford)
P1432
THTRC Circuit Failure (Ford)
P1441
Evaporative System Flow During Non-Purge
P1443
Evaporative Emission Control System (Mazda)
P1443
Small Or No Purge Flow Condition (Ford)
P1444
Purge Flow Sensor Low Input (Mazda)
P1445
Purge Flow Sensor High Input (Mazda)
P1450
Unable To Bleed Up Fuel Tank Vacuum (Ford)
P1451
EVAP Control System Canister Vent Solenoid Circuit Malfunction (Ford)
P1457
Leak Detected In EVAP Control Sys.(EVAP Canister Sys.) (Acura)
P1460
WOT A/C Cutoff Circuit Malfunction (Mazda)
P1460
WOT A/C Cutoff Circuit Malfunction (Ford)
P1461
ACP Sensor High Voltage (Ford)
P1462
ACP Sensor Low Voltage (Ford)
P1463
ACP Sensor Insufficent Pressure Change (Ford)
P1464
A/C Demand Out Of Range (Ford)
P1469
Low A/C Cycling Period (Ford)
P1474
HCF Primary Circuit Failure (Ford)
P1474
LFC Primary Circuit Failure (Ford)
P1476
Too Little Secondary Air (Chrysler)
P1477
Too Much Secondary Air (Chrysler)
P1477
MFC Primary Circuit Failure (Ford)
P1478
Battery Temp Sensor Volts Out of Limit (Chrysler)
P1479
HFC Primary Circuit Failure (Ford)
P1479
Transmission Fan Relay Circuit (Chrysler)
P1480
PCV Solenoid Valve (Chrysler)
P1482
Catalyst Temperature Sensor Circuit Shorted Low (Chrysler)
P1483
Engine Cooling System Performance
P1483
Catalyst Temperature Sensor Circuit Shorted High (Chrysler)
P1484
Catalytic Converter overheat Detected (Chrysler)
P1485
Air Injection Solenoid Circuit (Chrysler)
P1486
Evap Leak Monitor Pinched Hose (Chrysler)
P1487
Hi Speed Rad Fan CTRL Relay Circuit (Chrysler)
P1488
Auxiliary 5 Volt Supply Output Too Low (Chrysler)
P1489
High Speed Fan CTRL Relay Circuit (Chrysler)
P1490
Low Speed Fan CTRL Relay Circuit (Chrysler)
P1491
Rad Fan Control Relay Circuit (Chrysler)
P1491
Malfunction In EGR System (Acura)
P1492
Ambient/Batt Temp Sen Volts Too High (Chrysler)
P1493
Ambient/Batt Temp Sen Volts Too Low (Chrysler)
P1494
Leak Detection Pump Switch or Mechanical Fault (Chrysler)
P1495
Leak Detection Pump Solenoid Circuit (Chrysler)
P1496
5 Volt Supply Output Too Low (Chrysler)
P1498
High speed Rad Fan Ground CTRL Rly Circuit (Chrysler)
P1498
Voltage Problem In EGR Valve Position Sensor Circuit (Acura)
System Too Lean – Bank 1
Description:
How does a P0171 code trigger the check engine light? This code will trigger the check engine light as follows:
The adaptive fuel strategy in the vehicle’s computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Control Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running. Please refer to our article Oxygen Sensor Code Diagnosis for more info on this system. A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.
Possible Causes:
Refer to our Oxygen Sensor Code Diagnosis article for a list of all possible causes. The following is an overview of P0171 check engine light code possible causes.
Fuel System:
Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)
Air Intake System
Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulance caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter
Exhaust System
Any exhaust leak before or near the oxygen sensors
EGR System
Vacuum line disconnected from EGR System Module (ESM)
EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking
Secondary Air Injection System
Mechanically stuck secondary air injection valve
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