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Old 07-14-2003, 08:08   #1 (permalink)
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Mass airflow sensor problem

I drive a 95 T-Bird w/4.6L and have been having a problem for the last month or so with the Check Engine light coming on. The stored codes are 171 & 174 -- fuel trim system lean condition for both banks. I thought perhaps the injectors were dirty and ran a couple bottles of cleaner through the fuel system, but to no avail. I finally succumbed and took my car to the dealer, where they diagnosed a faulty mass airflow sensor with a $500 estimate to fix. Since they didn't have one in stock, I'm now researching my options to repair this problem to see if there's a more reasonable alternate to biting the bullet. Any suggestions out there? Thanks in advance for your help.
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Old 07-14-2003, 09:39   #2 (permalink)
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Re: Mass airflow sensor problem

The oxygen sensor on the right side is going out or is dead.

I would replace your O2 sensor first. On average they run 40 - 90 depending on the brand used.
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Old 07-14-2003, 09:41   #3 (permalink)
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Re: Mass airflow sensor problem

EEC IV Diagnostic Codes for Thunderbird & Cougar 1989-1997

Code 171: Oxygen sensor unable to switch, right side

Code 174: Oxygen sensor switching slow, right side

Just so you know.
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Old 07-15-2003, 06:56   #4 (permalink)
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This car apparently was produced later in the model year because it has the OBD II diagnostic system -- not the EEC IV.
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Old 07-15-2003, 08:24   #5 (permalink)
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Re: Mass airflow sensor problem

Obdii codes are as follows.
P0171 - Fuel Trim System Lean Bank 1
P0174 - Fuel Trim System Lean Bank 2

These have similar results as the EECIV codes.

Most likely cause of the code is one or more of the following....

Dirty air filter, loose oil dipstick, dirty/defective MAF, dirty injectors, vacuum leak around the intake manifold, a loose vacuum hose, evaporated emmissions purge control valve could have a wire connector disconnected, or possibly bad O2's.
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Old 07-16-2003, 19:24   #6 (permalink)
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If you do replace the mass air flow sensor don't let whoever quoted you $500 do it. They cost around $100 and it only took my wife only 20 minutes to replace it! Don't waste the money!
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Old 07-28-2003, 10:17   #7 (permalink)
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Re: Mass airflow sensor problem

That is true. MAFs are easy to replace with simple tools. Dont waste your time with someone else doing it.
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Old 07-28-2007, 07:25   #8 (permalink)
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Re: Mass airflow sensor problem

A massair flow is under 100$$ and takes about 10 minutes.
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