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P0171 - 05-23-2014

Check engine light came on today. Is this code a code for the front cats? My rears cats are turned off. What are the usual suspects?


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"system too lean"


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http://www.obd-codes.com/p0171

O2 sensor in front of the cat the downsteam (after cat) O2 sensor is normally what is turned off with aftermarket cats/exhaust.

Bank 1= passenger side.

Most likely a vacuum leak if you are only getting the code for bank 1. Could be the O2 sensor also.
   
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El Caballo Corre
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Quote:
Originally Posted by 05MoneyPit View Post
http://www.obd-codes.com/p0171

O2 sensor in front of the cat the downsteam (after cat) O2 sensor is normally what is turned off with aftermarket cats/exhaust.

Bank 1= passenger side.

Most likely a vacuum leak if you are only getting the code for bank 1. Could be the O2 sensor also.
It doesn't idle funny. I guess I could have a really small vacuum leak. I am leaning towards the O2 sensor. I guess it couldn't hurt to do a smoke test for leaks right?


J&M Extreme Joint UCA and LCA's
JLT True Cold Air Intake
Spec 1 clutch
SLP Line Lock
FRPP 4.10 gears
Steeda Short Throw Shifter
SCT Tuner
15" Racestars & MT ET Street Drag Radials (for track)
Glass Roof
Leather Seats
18 inch chrome wheels
SSS Adrenaline Exhaust
Summit X Pipe
Detroit True Track Differential
Tinted windows
mrbodykit window louvers
Shaftmaster 3.5" one piece aluminum driveshaft
GMS Front and rear safety loops
MSD Launch Master 2 step
Che K member brace
Che torque limiters
Che anti squat brackets
Steeda Charge Motion Delete Plugs
Koni single adjustable shocks/struts: THEY WORK!
Prothane Motor Mounts

Personal Best
1/8 mile 8.05 at 85.38 mph
1/4 mile 12.66 at 106.89 1.64 60 ft
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You could swap o2 sensors (front ones only) from side to side and see if the code changes. Clear the codes first after swapping them.


Mike - Three turbos, two Mustangs...do the math.

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Quote:
Originally Posted by TexasBlownV8 View Post
You could swap o2 sensors (front ones only) from side to side and see if the code changes. Clear the codes first after swapping them.
If you can get to O2's easy this is a quick test.
   
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