ses/ p0171

[jeggers]

Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

could the hpp3 cause this?

[killian96ss]

Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

could the hpp3 cause this?

No, but things to look for are exhaust leaks upstream of the affected 02 sensor, vacuum leaks around the intake manifold, or throttle body, faulty shut off valve or leak in the secondary air injection system, split or kinked vacuum hoses, low fuel pressure, leaks in the crankcase ventilation system, and leaks in the ductwork of the air induction system. Another possibility would be that the 02 sensor on bank 1 is faulty.

P0171

CIRCUIT DESCRIPTION

The Powertrain Control Module (PCM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy and emission control. Fuel delivery is controlled differently during Open and Closed Loop. During open loop the PCM determines fuel delivery based on sensor signals, without oxygen sensor input. During Closed Loop, the oxygen sensor inputs are added and used by the PCM to calculate short and long term fuel trim (fuel delivery adjustments). If the oxygen sensors indicate a lean condition, fuel trim values will be above 0 percent . If the oxygen sensors indicate a rich condition, fuel trim values will be below 0 percent . Short Term fuel trim values change rapidly in response to the HO2S voltage signals. Long Term fuel trim makes coarse adjustments in order to maintain Air/Fuel Ratio of 14.7:1. If the PCM detects an excessively lean condition, this Diagnostic Trouble Code (DTC) will set.

CONDITIONS FOR RUNNING THE DTC

DTCs P0101, P0103, P0108, P0135, P0137, P0141, P0200, P0300, P0410, P0420, P0430, P0440, P0442, P0443, P0446, P0449, P0506, P0507 or P1441 are not set.
The Engine Coolant Temperature (ECT) is between 75-115°C (167-239°F) .
The Intake Air Temperature (IAT) is between -20 to 90°C (4-194°F) .
The Manifold Absolute Pressure (MAP) is between 26-90 kPa (3.7-13 psi) .
The vehicle speed is less than 137 km/h (85 mph).
The engine speed is between 400-3,000 RPM .
The Barometric Pressure (BARO) is more than 74 kPa (10.7 psi).
The Mass Air Flow (MAF) is between 5-90 g/s.
The fuel level is more than 10 percent .
The Throttle Position (TP) is less than 90 percent .

CONDITIONS FOR SETTING THE DTC

The average long term fuel trim cell value is above 23 percent .
All of the above conditions are present for 6 seconds.

ACTION TAKEN WHEN THE DTC SETS


The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC


The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Use a scan tool in order to clear the MIL and the DTC.

DIAGNOSTIC AIDS

The system will go lean if an injector is not suppling enough fuel.
A lean condition could be present during high fuel demand.
Using scan tool, review Failure Records. If an intermittent condition is suspected, refer to Intermittent Conditions. See: Diagnostic Strategies\Intermittent Conditions


Steve

[jeggers]

Steve, thanks for the info . I was worried about the hpp3 because it has only been installed in the truck for 600 miles.

I cleaned the MAS, and cleared the DTC. I drove it for about 60 miles today and so far so good

If it comes back I will look into it a little more .

thanks again