Question about 2003 Dodge Caravan

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I have a 2002 caravan 3.3L engine light came on but was running fine. code Po171 (system too lean bank 1) no other codes. ran fine several days with engine light on . 3rd morning it wouldn't start. started when rear was jacked up to get to the fuel tank-pump-filter. runs but blows smoke and runs rough. can't find port to check fuel pressure.the fuel rail is not the same as shown in the repair manual. any help thanks

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The most propable cause is you have a vacume leak. Check all intake hoses for leaks and spray brake cleaner around intake gaskets if rpms change then you found a leak also clean your mass airflow sensor

Posted on Feb 04, 2010

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1 Answer

My engine idles and runs fine but has codes po171 and po174


Your still lean on both banks

Either the oxygen sensors failed or slowed
down & set a code or you have vacuum leaks

When ever you remove an intake-- you smoke it before
& after the job-- to avoid vacuum issues

Fuel Trim may give you some idea where to start

Can be rich both banks & driven lean

Dec 17, 2012 | 2002 Ford F150 Regular Cab

1 Answer

Which 02 sensor is faulty on bank 1, with the Generic error code PO171? (system too lean).


bank 1 is the side of the motor cylinder 1 is on.there fore bank 1 sensor is the sensor in the exhaust that comes off of the head wear cylinder 1 is.

Jun 14, 2011 | 2002 Dodge Caravan

1 Answer

Check engine light is on codes are po171 system too lean (bank 1) po174 system too lean (bank 2) so what can i do


Look for vacuum leaks,that are causing the O2 Sensors to go lean, and set codes on both banks

Nov 11, 2010 | 1997 Ford Expedition

1 Answer

1998 FORD CONTOUR CHECK ENGINE CODES P1131 AND PO171. REPLACED 1 OF THE OXYGEN SENSORS, CHANGED PLUGS, PLUG WIRES, OIL AND FILTER, ALSO REPLACED AIR FILTER AND CLEANED PCV FILTER, RESET PC AND IT RAN GOOD...


sounds like EGR valve and sensor this controls idle speed when at a stop. the po171 is a burn lean or rich code need to know what bank 1 or 2. also check for a vacuum leak from one of the hoses.

Aug 07, 2010 | 1998 Ford Contour

1 Answer

Generic code PO171 system 2 lean bank 1 generic


This can be caused by a faulty mass air flow sensor

Jul 06, 2010 | 1999 Ford Taurus

1 Answer

Have this code PO171, what does this mean.


Not sure that the O2 sensor was bad. It sounds like it was telling you that side of the exhaust system was picking up a lean mixure at the O2 sensor. The O2 sensor was doing its job by telling you the mixture changed. If the O2 sensor was bad, it would say low voltage range for that sensor, or open curcuit.
Now the car has had time to do its diagnostic sweep, it is telling you the same thing, but from a different sensor...the fuel mix is too lean. Air/spark/and fuel is what you need in the correct amounts. In your car, the ECM engine control module controls this by taking readings from all the sensors several hundred times a second.
Mechanically, you have a few options. Change the fuel filter...under the car on the passenger side. It is an easy job.
Change the fuel pressure regulator. This keeps the fuel at 4 BAR so the fuel injectors can do their job correctly. This job just needs a screw driver to pop off the clip that holds it in place. No hoses need to be removed. It is on top of the intake manifold, in-line with a metal fuel line and a rubber one.
The fuel injectors could be clogged up on one side of the engine. Run some fuel injector cleaner through a tank of gas. Also, listen for a constant ticking sound at each injector. If one sounds off PAR, then replace it.
The fuel pump may not be giving you enough power. However, the readings seem to be localized to one side, so I doubt it.
Start with the easiest thing, and see if it works. Also, you will need to get yourself a VAG scan tool. It is the only one with codes in it for all of your VW systems, not just engine codes like the ODB scanners. You can get a nice one for $50 on-line.
Good Luck!

Feb 24, 2010 | 2002 Volkswagen Passat

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

Codes P0171 and P0316


code po316 is a random misfire like plugs or wires po171 will cause po316 po171 is a lean o2 code on bank # 1 that is a vacuum leak need to check it better for a vac leak

Dec 14, 2008 | 2003 Ford Windstar

2 Answers

What does engine fault code po171 system too lean bank 1 mean thanks


i think its the oxygen sensor (pre cat) in exhaust

Sep 23, 2008 | 2002 Nissan Altima

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