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post #1 of 3 (permalink) Old 10-14-02, 01:12 PM Thread Starter
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Join Date: May 2001
Posts: 5
Need help troubleshooting codes

I have two trouble codes that keep coming up on my '95 GM with 96k miles. 171 (system too lean bank 1) and 174 (system too lean bank 2) Any help would be greatly appreciated.

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post #2 of 3 (permalink) Old 10-17-02, 01:22 PM Thread Starter
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I have cleaned the maf, but am still getting the two codes.
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post #3 of 3 (permalink) Old 01-25-03, 08:42 AM
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Location: Norwood, OH
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The O2 sensors could be reading wrong. When I had the Lean codes in my Marquis replacing them did the trick.

Ray


1993 Grand Marquis w/170,000+ miles and counting. Now it's time to make her FAST!!!

Current mods:
12" conical K&N filter, Custom side exit exhaust with X-pipe and Dynomax Super Turbo mufflers, replaced stock fan and clutch with PI electric fan and PSM fan controller, Aluminum PI driveshaft.
Body mods include a '95 Cobra rear spoiler, tinted windows, 17" Mustang Split 5-spoke rims w/ P255/50-17 BFG g-Froce TA radials, and a 14,000lb Auxillary Trans Cooler.
Interior: Custom A-pillar guage pod w/ Digital oil pressure and Trans. Temp. guages.
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