Check Engine Light on a 96 Jeep Cherokee Reading Bank 1

What Does Code P0171 Mean for Your Jeep?

P0171 definition : Bank 1 has likewise much air or not enough fuel
Issue Severity: MODERATE– Extended driving with this lawmaking can cause internal engine damage.
Repair Urgency: Get this code fixed as shortly as possible to avoid damage to spark plugs, pistons, and catalytic converters.
Diagnosis: It is important to consummate the entire diagnostic process when diagnosing the Jeep P0171 code. Many people will replace the air-fuel sensor or oxygen sensor equally soon every bit they get a bad reading, simply the root cause tin can also be a dingy or faulty mass airflow sensor or vacuum leak, thus causing the O2 or MAF sensor to read differently to recoup.

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Combustion engines run about efficiently when they maintain an air-fuel mixture ratio of 14.vii parts air to ane function fuel. Too much fuel and/or also little air results in the engine running rich setting a P0172 trouble lawmaking, while too petty fuel and/or too much air results in the engine running lean resulting in a check engine light for the Jeep P0171 code. The lean condition can exist acquired by a vacuum leak, which introduces more than air into the air-fuel mixture, or by a weak fuel system, which does non input enough fuel into the air-fuel mixture. To proceed the engine running properly, the powertrain control module (PCM) tries to compensate for the lean status by injecting more than fuel to the mixture in an effort to maintain the proper 14.vii:i ratio. When these adjustments get too big, the Jeep P0171 code is triggered.

P0171 Causes

Faulty or dingy mass airflow sensor
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket.
Weak fuel pump
Clogged or muddied fuel injectors
Clogged fuel filter
Frazzle leak
Faulty oxygen sensor
Faulty air-fuel ratio sensor

P0171 Symptoms

Cheque Engine Light is on or flashing
Lack of power from the engine
Rough idle
Engine "cough" or misfiring
Tip of spark plugs are white
Ordinarily associated with error codes: P0174

How Do I Fix Code P0171?

Jeeps and check engine lights aren't strangers, so just as with any DTCs, in diagnosing a Jeep P0171 code is to figure out what is causing the engine to run lean. Using the live data part of the FIXD sensor and app allows you lot to read and analyze fuel trims to properly diagnose a P0171 code.

If your engine is running lean and you're not comfy diagnosing this outcome at abode, we recommend finding a RepairPal-certified shop to pinpoint the problem and give an accurate estimate for repairs.

These shops can non only help you lot figure out what's going wrong before y'all waste time and money on the incorrect parts, but they also offer a minimum 12-calendar month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing.

> Find a RepairPal Certified Shop Well-nigh Y'all

How Much Does Information technology Toll to Fix Code P0171?

If y'all take your Jeep to a shop for diagnosis, near shops will beginning with an hour of "diag time" (the time spent in labor diagnosing your specific issue). Depending on the shop's labor rate, this typically costs somewhere betwixt $75-$150. Many, if not well-nigh, shops will apply this diagnosis fee to any required repairs if yous take them perform the repairs for y'all. From there, a shop will be able to give you an accurate judge for repairs to fix your P0171 lawmaking.

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Possible Repair Costs for P0171

When it comes to making repairs associated with the Jeep P0171 code, ane or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the toll of the relevant parts and the toll of labor required to make the repair.

Vacuum leak $100-$200
Clean MAF $100
Supersede MAF $300
Fuel Pump $1300-$1700
Fuel pressure regulator $200-$400
Exhaust repair $100-$200 (if welded to repair)
Air fuel sensor or oxygen sensor $200-$300

DIY Steps to Diagnose Lawmaking P0171

If you'd like to try to fix code P0171 at home without throwing money at parts, y'all'll want to follow the steps below for proper diagnosis. Continue in heed this is an intermediate-level diagnosis and repair and not recommended for beginners. Diagnosis requires more specialized equipment beyond what the FIXD Sensor can provide and it can be a time and labor-intensive process for inexperienced DIYers.

DIY difficulty level: Intermediate

This repair requires mechanical knowledge and is not recommended for beginners.

Tools/parts needed (our top picks from Amazon):

FIXD
Mass Air Catamenia Cleaner
Fuel Pressure Testing Gauge
Screwdriver
Pliers

Stride ane: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE PRESENT.

Use FIXD to scan your vehicle to verify the Jeep P0171 code is the merely DTC present. If other codes are present, they must exist addressed first.

Pace two: Inspect VACUUM LINES.

Audit all vacuum lines and hoses for leaks, and make sure they are properly continued. If a leak is present, you lot will hear a hissing audio, though it may be hard to hear with the engine running. If yous doubtable a vacuum leak only are having trouble finding it, check out this detailed guide to finding vacuum leaks.

Footstep 3: Inspect MASS AIR Menses (MAF) SENSOR.

Remove the mass airflow sensor and clean the sensor using mass air flow cleaner or contact cleaner.

> How to clean your MAF sensor

STEP 4: INSPECT Frazzle System.

Cheque the frazzle system components for leaks before the Air Fuel Ratio Sensors or Oxygen sensors; if y'all observe whatsoever leaks have them repaired. Frazzle leaks can usually be spotted visually by a buildup of soot in the full general vicinity of the leak.

Pace five: Bank check FUEL PRESSURE.

Low fuel pressure tin throw off the air-fuel mixture ratio, and this could be caused past anything from the fuel injectors and fuel pressure regulator to the fuel pump.

> How to check fuel pressure

Check fuel injectors: Make sure the fuel injectors are functioning properly and activating. Random misfires tin can be a sign of faulty or clogged fuel injectors that need to be replaced. Likewise, check that the fuel injector wiring is not damaged and is continued properly.

> How to check fuel injectors by ear

> How to check fuel injectors with a digital multimeter

STEP 6: Supersede AIR-FUEL AND/OR O2 SENSORS

At this point if the code even so persists you lot may want to consider replacing your A/F sensor or O2 sensors.

Pace 7: INSPECT AND REPLACE SPARK PLUGS

After you lot repair the cause of your P0171 code, audit the spark plugs. If there is a white haze or chaff on the tip of the spark plugs (near the diode that screws into the engine), then you should replace all of the spark plugs .

Common P0171 diagnosis mistakes

It is important to consummate the entire diagnostic process when diagnosing P0171. Many people volition supersede the air-fuel sensor or O2 sensor as soon as they get a bad reading, simply the root cause is often a dingy or faulty mass airflow sensor or vacuum leak, thus causing the O2 or A/F sensor to read differently to compensate. Reading and analyzing fuel trims and the freeze frame information is the fundamental to properly diagnosing P0171.

Nevertheless Need Assist Fixing Code P0171?

If you've followed the steps in a higher place and are still experiencing a lean engine condition and Jeep P0171 code, please contact the FIXD Mechanic Hotline if you're a FIXD Premium subscriber or find a RepairPal certified store near you to get the right repairs at a fair toll.

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Source: https://www.fixdapp.com/blog/p0171-jeep/