I have codes 172 and 176 as well as codes 181 and 189 on my 1994 5.0L mustang. I have tried cleaning the Mass air flow screen. What other part can cause this problem?
SOURCE: 2000 expedition- mass air flow sensor and computer
Sound like you have a big vacuum leak. Check the hoses that attch the PCV valve on the valve cover on the passenger side. Also reach way back on top of the engine there's another hose there that is known for going bad. The dealer has those hoses and they call it the Heated PCV valve hose assembly. Very common problem.
SOURCE: 1994 ranger 2.3 lacks power and has a miss. put
I would check for a vacuum leak, also check the air filter and replace the fuel filter, if it hasn't been done.
SOURCE: 2001 mustang 3.8 stumble and missfire no check engine light
A stumble or misfire,especially when the vehicle stall when coming on to a stop sign are 2 things for concern, A Cam position sensor which are prone to set a rolling engine surge and a stumble. This sensor when it fails does not necessarily give a code,so dont expect one. A EGR can cause this but the prone failure of all is the Cam position sensor
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.
Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.
Symptoms
You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
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Causes
A code P0171 may mean that one or more of the following has happened:
Possible solutions include:
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