Obd code system to lean bank 1&2
Lean on Bank 2 means one side of the engine is getting less fuel or too
much air. I also own a 4.0L and I work on these models for this code
consistantly. Usually if you have a vacuum leak at the pcv valve hose
behind the throttle body you will get a lean Bank 1 and 2.
My recommendation in these cases would be to change the PCV valve (helps
with your gas milage) and the fuel filter; other than that you will
have to be sure the fuel pressure is correct and there is no vacuum
leaks on the driver side of the engine. I am 90 percent sure the fuel
filter, pcv valve and clearing the codes will correct this issue.
Here I find one TSB...
MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED - SYSTEM LEAN DIAGNOSTIC TROUBLE CODES (DTC'S) - SERVICE TIPS
2000-2003 Escort ZX2
2000-2004 Crown Victoria, Focus, Mustang, Taurus
2000-2004 Econoline, Excursion, Expedition, Explorer, F-Super Duty, Ranger
2000-2004 LS, Town Car, Navigator
2000-2004 Grand Marquis, Sable, Mountaineer
ISSUE: This article is intended to aid in diagnosing DTC's P0171, P0174,
P1130, P1131, P1150, P1151, P2195, or P2197 (system lean or lack of
HEGO switches) when a vacuum leak is present. HEGO sensors, MAF sensors,
and PCM replacements are not an effective repair when a vacuum leak is
causing the above DTC's.
ACTION: Perform the following inspections/repairs when the above codes
are found in memory. Procedure provides instructions on how to make
comparisons of the total fuel corrections (using scan tool or
equivalent) at idle and high RPM's to help determine if a vacuum leak is
the root cause of the DTC's.
NOTE FREEZE FRAME AND ADAPTIVE FUEL VALUES (ASSOCIATED WITH "LONGFT"
PID) WILL NOT BE AVAILABLE IF A KAM OR OBDII RESET WAS RECENTLY
NOTE FREEZE FRAME DATA WILL INDICATE THE ENGINE AND AMBIENT CONDITIONS
WHEN THE DTC WAS SET. THESE ARE IMPORTANT BECAUSE THE VACUUM LEAKS MAY
OCCUR ONLY WITHIN SPECIFIC TEMPERATURE RANGES AND MUST BE DUPLICATED TO
DETECT THE LEAK.
NOTE FUEL TRIMS AT IDLE ARE PARTICULARLY SENSITIVE TO VACUUM LEAKS SINCE
THE UN-METERED AIR LEAKAGE FLOW IS A HIGHER PERCENTAGE OF TOTAL AIRFLOW
AT IDLE THAN AT PART THROTTLE. THE BAROMETRIC PRESSURE (BP) PID IS NOT
RECOMMENDED TO VIEW WHEN DIAGNOSING A VACUUM LEAK. BP IS AN INFERRED PID
CALCULATED DURING HIGHER ENGINE LOADS.
Jan 20, 2012 |
1996 Ford Explorer