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1996 yukon has rough idle and sets code p0172

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P0172 is system running rich. Classic case of bad/dirty injectors. Have them cleaned for about $60 each, buy a cleaning kit HERE or replace them (pricey). Diagnostic Trouble Code (DTC) P0172 Fuel Trim System Too Rich Detailed Diagnostic Assistance: Note: After repairs, use the scan tool Fuel Trim Reset function to reset the long-term fuel trim to 128 (0%). Fuel pressure ? An excessively low pressure will make the system lean. Monitoring fuel pressure while driving the vehicle at various road speeds and/or loads may become necessary here. Map sensor - An output that enables the ECM to sense a manifold pressure which is less than normal (high vacuum) can drive the system lean.In such a case disconnecting the MAP sensor will permit the ECM to substitute a fixed (default) value for the MAP sensor. If disconnecting the sensor kills the lean condition then substitute a known good sensor and recheck. Fuel contamination - In trace amounts, water , near the in-tank fuel pump inlet can be added to the injector. water results in a lean exhaust condition and can set DTC P0171. Check for poor O2S or MAP sensor connection at the ECM. Inspect the harness connectors for the following conditions: Improper mating Damaged terminals Broken locks Improperly formed or Backed-out terminals Poor terminal-to-wire connection · Also examine the wiring harness to check whether there is any damage. · If the harness seems flawless, then note the O2S display on the scan tool as you move the connectors and the wiring harness related to the engine harness. · Any difference in the display will denote the location of the fault. · You must check the 5 volt reference circuits to inspect whether a short to voltage is in vogue in case you see any DTC P1404 is set. · You also need to see if there is any restricted exhaust system. · Probe the 5 volt reference sensors for abnormal readings in case a shorted 5 volt reference circuit creates a DTC P0172 to set. Thanks for using FixYa!!

Posted on Sep 25, 2009

  • blueextc3221
    blueextc3221 Sep 25, 2009

    sorry that all ran together. Looked good on my screen. I dont know what happened.

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1 Answer

My check engine light is pulling up code P0172 my read out says the problem is in bank one only


P0172 is bank 1 rich. May have a fuel injector stuck open or a bad o2 sensor.

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I got a code p017.2 AND P017.1 for a 2005 dodge grand caravan sxt 3.8l


Po171 not P017.1 system lean http://www.obd-codes.com/p0171

P0172 not P017.2 system rich http://www.obd-codes.com/p0172

bad mass air flow sensor , O2 sensor , PVC system problem

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Car Runs to Lean. Help!


http://www.obd-codes.com/p0172
P0172 is running too rich, not lean. Was it a typo, or did you really have P0172 (just like my Buick, same two codes [0300, 0172]- and still working on it). Go to the site above and look. (All codes are there for descriptions and diagnosing procedures.)
If it is too lean, possibly a vacuum leak from a bad hose or the intake manifold.

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Code p1072 came up..rough idle on and off. 2002 dodge caravan


http://repairpal.com/OBD-II-Code-P0172-and-P0175

There are many potential problems but first buy some spray MAF cleaner and clean the mass air flow sensor. It will set you back less than $10. Do not stick anything into the sensor. Just let the cleaner do the work.. Allow it to dry completely before installing. The link above will give you more avenues to help you diagnose the problem.

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I was told I failed the NY inspection test due to error codes po172 and po300. What do these indicate is wrong and where the problem may be??


p0300 is code for miltible misfires. The p0172 is code for a rich reading from engine bank #1, this code may be set by the misfireing causing raw fuel to exit that bank to the sensor in the exhaust system. The most common cause is spark related, spark plugs, wires, dist. cap. etc. A less common cause is with the fuel injection system.

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1996 chevy truck 5.7L has codes P0172, P0172 were


p0172 is--system to rich ( bank 1). an oxygen sensor on bank 1, detected a rich condition ( to little oxygen in exhaust ) v6-v8 - v10 engines, bank 1 is the side of the engine that has # 1 cylinder. causes could be a vacuum leak in a hose, a dirty or bad maf sensor, or fuel pressure or delivery problems.

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