Question about 1993 Saturn SL2

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Engine light I get a code po171 lean bank 1 on my saturn sl2. can you tell me what i should be looking for? Saturn sl2 2001

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It could be a faulty front O2 sensor or a faulty coolant temperature sensor. A basd temperature sensor could be letting the engine run lean and the O2 sensor is picking this up.

Posted on Jul 07, 2009

  • Mike Jul 08, 2009

    Before you replace anything, have realtime data read while the engine is running an at operating temperature. This will determine weather its the O2 sensor or the ECTS (engine coolant temperature sensor).


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Most likely this is the O2 sensor for that cylinder bank is defective.

Posted on Jun 24, 2009


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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

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

2002 saturn sl2 trouble code PO172 rich to bank 1

it's your fuel injection system bank one would be injector one. so my advice, replace the fuel injectors after first dropping fuel tank and looking for any sediment in base of tank.

Sep 01, 2010 | 2002 Saturn S-Series

3 Answers


Hi Jonah,

I have the same problem and it only propped up after i had my exhaust manifold repaired, do you think the mechanic didnt do the weld it right?

2001 Saturn L200

Apr 27, 2010 | 2000 Saturn SL

2 Answers


very important oem or aftermarket 02........ big difference... one trouble shooting tech is to fill tank use mid grade gas and add to bottles of injector cleaner addative to tank clear code and run see if still same code..... also make sure plugs are basic plugs no high dollar split fire or so..if still no good get a name brand can carb cleaner... with car running.. open intake and spray cleany continously while you work the throttle with the other hand .. keep it just barely running this will burn off any carbon and clean 02's... even new ones... if still prob write me back for more steps

Sep 01, 2009 | 1993 Saturn SL2

1 Answer

Service Engine Light in 2001 Saturn SL2

Depending on the code. Let me know what the code is, and I will tell you what it affects, and how serious it is.

Jun 25, 2009 | 2001 Saturn SL

1 Answer

2000 Saturn LS Service Engine Soon Light

codes are for fuel system lean bank 1 and 2. low fuel pressure or innacurate mass air flow sensor could cause this. most common is mass air flow sensor.

Feb 20, 2009 | 2001 Saturn S-Series

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

1 Answer


It is telling you the fuel system is not seeing any closed loop switching, the signal from an O2 always varies between rich and lean, back and forth, you can have 3 things going on, one the O2 is lazy or has failed, but most times that would trip a lean code, the more likely cause is a problem in the fuel control, either to rich or to lean. without the actual voltage readings from the O2 it is hard to tell you what to replace, do you have a system monitor tool?

Aug 07, 2008 | 1993 Saturn SL2

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