diy auto repair

Chevy / GM P0171 or P0174 System To Lean Bank 1 Bank 2

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I’m going to go over some common issues causing the P0171 and P0174 error codes in Chevy and GM vehicles, indicating a system too lean in both Bank 1 and Bank 2.

Under standing fuel trim numbers can aid greatly in get to the source of the problem. We start by conducting a smoke test on the intake to detect any leaks. Next, we assess the condition and performance of the mass air flow sensor and fuel pressure test to ensure they meet specifications.

Further inspections include the PCV valve and the brake booster, along with other critical components like fuel pressure regulator, that could lead to a lean-running engine.

Whether you’re a DIY enthusiast looking to understand more about your vehicle or a professional mechanic honing your skills, this video provides step-by-step guidance on diagnosing and fixing lean engine problems and understanding fuel trim reading on a scanner.

#ChevyRepair#LeanBank1Bank2#AutoRepair#CarMaintenance#DIYMechanic#P0171#P0174#FlatRateMechanic

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Most Common Cause of a P0101 “Mass Air Flow (MAF) Circuit/Performance Malfunction”

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Most Common Cause of a P0101

Most common cause of a p0101 “Mass Air Flow (MAF) Circuit/Performance Malfunction”?
Code P0101 Definition
Mass Air Flow (MAF) Circuit/Performance Malfunction

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Code P0101 Meaning
The mass air flow (MAF) sensor measures the amount of air entering the engine. Check engine light code P0101 is set when the measurement of air entering the engine by the mass air flow sensor is outside of the manufacturer’s specified range.

Symptoms
Engine stalling
Difficulty starting
Lack of power
Rough idle
Causes
Dirty, obstructed, or faulty mass air flow sensor
Damaged or disconnected air intake boot (snorkel)
Vacuum leak
Clogged or improperly installed the air filter
Clogged catalytic converter / restricted exhaust

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P0141 P0161 O2 Sensor Heater Circuit “Chevy Truck 5.3L 6.0L”

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P0141 P0161 O2 Sensor Heater Circuit

Diagnose check engine. Found light stored code p0141 for O2 sensor heater circuit bank 1 sensor 2. Drivers side after the catalytic converter.

Checked both fuses and the under hood fuse compartment for the O2 sensor heaters and both checked good. Accessed bank 2 O2 sensor after the cat and found 02 sensor wiring had been rubbing on front drive shaft on the O2 sensor side. Checked the vehicle side for power to O2 sensor heater and tested good. O2 sensor will need to be replaced due to wiring damage on this Chevy Silverado.

2004 Express 1500 5.3
2004 Silverado 2500 HD 6.0
2004 Silverado 3500 6.0
2004 Sierra 1500 5.3
2004 Sierra 2500 HD 6.0
Customer Concern: Setting trouble codes P0141 and P0161.
Average Reported Mileage: 106957
Tests/Procedures: 1. With a cold engine, turn the key on engine off and monitor O2 voltage. Within 2 minutes, the voltage should drop to about 150 mV.

2. Verify there is 12 volts on the Pink wires to both O2’s. If no voltage check the O2B fuse for blown.

3. If the fuse is blown check wiring to the sensor for chafing on the transmission or transfer case.
Tech Tips: Heater Current Test
• The PCM detects that the affected HO2S Heater current parameter is more than 1.375 amps or less than 0.25 amps.
• The above condition is met for 10 seconds.
Heater Resistance Test

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