Question about 2002 Acura 3.5RL

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Intermiting combustion 98 acura

Hesitates same times at 40 mls./hour or 60ml/h.
check engine light cod:
PO171 System too lean (bank 1)
PO170 Fuel trim malfunction (bank 1)

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Clean the MAF sensor with CRC brans MAF spray cleaner.

Posted on Nov 02, 2008

  • Mattew Matijevich Sep 07, 2012

    I've looked up and down my Acura's engine, as well as look through the service manual, and I don't see anything that looks like the MAF sensor...where would it be located on a 98 Acura Integra?

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2 Answers

What does code po171 mean.


System too lean, bank 1.

Dec 11, 2014 | Cars & Trucks

1 Answer

1999 check engine light on code po170 , start car up and sometimes get hesitation when stepping on gas, ??


PO170 Fuel Trim Malfunction (Bank 1)

I'm going to guess you do No Preventative
Maintenance what so ever, or know what is needed

The Oxygen Sensors get replaced at 100,000 miles
or when they fail or when their switching times & data
are not as it should be

Spark Plugs-every 3 years

It costs money to work on a vehicle to learn how things are
& collect needed data, when it appears to get you places
with no issues,then you have problems & lots of them & no
record of when it did work correctly

O2 Sensors are big part of fuel trim-- IF-- you have no vacuum
leaks or cylinder misifres

An old blocked exhaust converter can be a problem

I would:
Replace the spark plugs
Replace all O2 Sensors
Clean the MAF Sensor
Replace any cat over 12 years
Check Fuel Trim
Check to see all 8 Emission Monitors run-- on a long 25
mile road test-after other work is caught up
EGR -issues
Exhaust Leaks before converter
Evap System-Leaks

Have to check & test it all-the entire vehicle
BEFORE -you replace the cat

Aug 11, 2014 | 1999 Honda Accord

1 Answer

4 Codes in computer


code p0128 indicates a mechanical fault ( could be the thermostat stuck open)
code p0174 -system too lean -bank2 ===causes --intake /exhaust leak--fuel pressure/pump--injectors--AIR system--hose connection/s
code po171 refers to system too lean bank 1 same as po174 with the HO2S sensor being the culprit. As to all being related . only by way of the o2 sensors
code p0442 is not connected to the first 3 as it is in a different section of the fuel system

Apr 09, 2014 | 2003 Saturn VUE

1 Answer

P1404 98 olds intrigue


Po137 02 sensor circuir low voltage bank 1
Po171 fuel trim system lean bank 1
p0336 crankshaft oosition sensor A circuit/range oerformance
p1404 IAT-B CIRCUIT Malfunctiin/EGR CLOSED PISITION PERFORMANCE

Nov 08, 2013 | 1998 Oldsmobile Intrigue

1 Answer

PO121 code still on, replaced o2 sensors, replaced cracked air tube, put seafoam in gas. reset computer, light came back on after 40 miles. same codes. DIAGNOSTIC TROUBLE CODES PO171 System Too Lean...


PO121 : TP Sensor Performance = The PCM supplies 5V to the TP sensor(throttle position). The TP sensor is a variable resistor that drops the voltage to about 4 volts at WOT(wide open throttle) to less than 1 volt at closed throttle. Some TP sensors are adjustable. others have a learn procedure to determine closed throttle. PO171 Fuel Trim System Lean = In closed loop the PCM adjusts fuel delivery based on H2OS 1 readings and is indicated by long & short fuel trim values. If lean the PCM will add fuel (fuel trim above 0%) & if rich the PCM will reduce fuel(fuel trim below 0%) PO128 ECT Below Thermostat Regulating Temperature = possible failed thermostat, low or empty on coolant, Engine Coolant Temp Sensor, Poor connection/Harness/Wires, faulty PCM Connection. I think you hit the nail on the head , the ECT Sensor ( which is different than the temp sensor for the dash gauge)

Jan 18, 2011 | 1999 Kia Sephia

2 Answers

A po171 code came on my scanner i need to know


system too lean in bank 1. clean your mass airflow sensor, replace fuel filter. iff all else fails check you fuel pump.

Nov 06, 2009 | 1998 Ford Contour

1 Answer

PO171


P0171 - Fuel Trim System Lean Bank 1
YOU WILL NEED TO AVE THE DEALER TEST THE O2 SENSOR FOR PROPER SWITCHING, RIGHT NOW IT SHOWS ALWAYS LEAN, THIS MAY BE THE SENSOR OR THE ENGINE MAY REALLY BE LEAN ON FUEL AIR RATIO, AS FAR AS THE SMOKE GOES THE 2 ARE PROBABLY NOT RELATED, HOW MANY MILES ON CAR? IF THE MILES ARE HIGH THEN REPLACE THE O2 SENSOR ON THE CYLINDER BANK WHERE # 1 CYLINDER IS LOCATED, THE SENSOR IS THE ONE BEFORE THE CATALYTIC CONVERTER.

May 08, 2009 | 2000 Chevrolet Monte Carlo

7 Answers

P0171 Code (Lean Fuel Bank 1) Engine light on


you nead to check all you vacuum lines for leaks it sounds like you have a vacuum leak or the o2 sensor is going bad on bank 1 **** i still say vacuum leak

Nov 23, 2008 | 1998 Buick LeSabre

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