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Discussion Starter · #1 ·
Emission service message appeared followed by Check engine light staying ON, used Generic Scan tool to retrieve DTC's and the code P1171 was the only code stored in memory, I have a subscription to ALLDATA where the description for this code is "Long term fuel trim Upper limit"<p> Has anybody in this group had any experience with this trouble code and what was the fix?<p> Thx <p> Helder<br>
 

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Re: 01 S60 T5 160K trouble code P1171 EMISSION SERVICE RELATED (HELDER)

Good guess would be an 02 sensor
 

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Re: 01 S60 T5 160K trouble code P1171 EMISSION SERVICE RELATED (HELDER)

OBDII code P1171 = Volvo ECM 261A<p>Diagnostic trouble code (DTC) information<p>Condition<p>The control module receives information from the heated oxygen sensor (HO2S) about the fuel / air mixture when idling at both the lower and upper part-load range. If the fuel / air mixture deviates from λ=1, the short-term fuel trim will compensate for this by adjusting the injection time so that λ=1 is achieved. When the short-term fuel trim makes an adjustment, the integrator median must be adjusted by the long-term trim. Diagnostic trouble code (DTC) ECM-261A will be stored when the long-term trim must be adjusted to almost maximum in the lower part load area.<p><br>Substitute value <br>none<p><br>Possible source<p>Upper limit:<br>-intake air leakage<br>-exhaust system air leakage<br>-low fuel pressure<br>-defective heated oxygen sensor (HO2S)<br>Lower limit:<br>-intake air leakage<br>-high fuel pressure<br>-leaking injectors<br>-defective mass air flow (MAF) sensor<br>-contaminated engine oil<br>-oil level too high<br>-defective heated oxygen sensor (HO2S)<p><br>Fault symptom <br>-none<p>As JRL States best gues is a bad O2 sensor. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p>Eric
 

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Re: 01 S60 T5 160K trouble code P1171 EMISSION SERVICE RELATED (HELDER)

JRL and Eric,<p> The O2 sensors are probably contaminated and at 160K Km's are due to replace anyway.<p> I re-set the check engine light almost a week ago with a generic scan tool (MacTools) and so far it hasn't come back, however I will be replacing the two sensors anyway, Any idea how much these O2 sensors cost? Can aftermarket such as NTK or Bosch be used?<p> Thx for the reply<p> Helder<br>
 

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Re: 01 S60 T5 160K trouble code P1171 EMISSION SERVICE RELATED (HELDER)

A LOT
 

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Re: 01 S60 T5 160K trouble code P1171 EMISSION SERVICE RELATED (HELDER)

Not if you want the check engine light off.....<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>HELDER</b> »</i></TD></TR><TR><TD CLASS="quote">Can aftermarket such as NTK or Bosch be used?<br></TD></TR></TABLE>
 
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