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Old 04-29-2010, 01:45 PM
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Join Date: Jan 2010
Posts: 81
Default Diagnostic Trouble Codes (DTC)

Well it finally happened. Check engine light came on.

Checked for DTC's. Got a PO171 "system too lean bank #1" and PO174 "system too lean bank #2"

The PO171 also had additional information reading:

Fuel Sys 1 CL
Fuel Sys 2 CL-Fault
Calc Load% 30.20
ECT 190 degrees
STFT B1% -0.78

I'm old school when it comes to this stuff.....any of you younger folk help me out?

What are the common causes of these two trouble codes?

Where should I start?

Engine seems to run fine.

I cleared the codes last nite (too see what would happened) It ran all day today off and on in city driviing for about 25 miles before the lite came back on.

Any of you electronic gurus out there?
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Old 04-29-2010, 02:46 PM
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Default Re: Diagnostic Trouble Codes (DTC)

Get MAF cleaner and clean you Mass air flow sensor. Mine threw that code, cleaned it and that cleared it right up
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Old 04-29-2010, 02:50 PM
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Posts: 325
Default Re: Diagnostic Trouble Codes (DTC)

Check out the rubber elbows that goes from the PCV valve to under the Throttle Body. I'll need to know what engine you have to be more helpful. Those elbows are notorious for cracking. If it is the rubber elbow. replace it with rubber heater hose.
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Old 05-07-2010, 10:35 AM
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Default Re: Diagnostic Trouble Codes (DTC)

Well....after alot of reading and research.....I found the problem.....VRod21....you were right.....the rubber elbow that goes fromthe PCV valve to under the Throttle Body was indeed cracked.....the truck ran fine with the crack....must have been just enough air leakage to set off the codes overtime though.....I took the cover off the Throttle Body and saw the inch long crack in the hose.....hard to recognize.....pushed my finger on it and the engine died......BOY!....that saved me moooocho bucks I'll bet...! Thanks for the input.....I found another site called "OBDII.com" that helped alot also.....
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