2002 Blazer 4.3 Obd 2 O2 Sensor Reading

What Does Lawmaking P0138 Mean?

P0138 definition: O2 Sensor Excursion Loftier Voltage (Bank 1, Sensor ii)
Issue Severity: MODERATE – Extended driving with this lawmaking tin can crusade internal engine damage.
Repair Urgency: Get this code stock-still withing the next month to prevent internal engine damage.
Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0138 code. This DTC can be triggered by a faulty oxygen sensor or incorrect fuel pressure.

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Oxygen sensor two is the downstream oxygen sensor in relationship to the catalytic converter. Information technology measures the amount of air and fuel coming out of the catalytic converter to ensure the catalytic converter is performance properly. If the voltage is high (approx. .9V) there is an excess of fuel in the mixture. If the voltage is low (approx. .1V) then there is an excess of air in the mixture. Therefore, the downstream oxygen sensor (sensor two) should produce a steady voltage of approximately 0.45 volts. When problem code P0138 is set, this indicates that there is a high voltage (steadily above .9 volts) for more than 10 seconds indicating a lack of oxygen in the frazzle stream and an abundance of fuel at sensor ii on the banking company i of the engine.

P0138 Causes

Faulty O2 Sensor
Brusk to battery voltage in O2 sensor signal circuit
Corroded wiring
Fuel force per unit area too high
Engine coolant temperature sensor

P0138 Symptoms

Cheque Engine Light
Engine runs rich
Lower fuel economy
Crude idle
Stiff fumes

How Do I Set up Code P0138?

With a P0138 lawmaking, the start pace is to become it properly diagnosed to effigy out what is causing the malfunction in the oxygen sensor voltage. Using the live information function of the FIXD sensor and app allows y'all to read and analyze inputs from the oxygen sensor to properly diagnose a P0138 lawmaking. If you're not comfortable diagnosing this issue further at home, we recommend finding a RepairPal-certified shop to pinpoint the problem and give an accurate guess for repairs.

These shops can non just aid y'all figure out what's going wrong before y'all waste time and money on the wrong parts, but they too offer a minimum 12-month, 12,000-mile warranty and stand up behind all their estimates with guaranteed fair pricing.

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How Much Does It Cost to Fix Code P0138?

If y'all take your car to a store for diagnosis, almost shops will outset with an hour of "diag time" (the time spent in labor diagnosing your specific result). Depending on the shop's labor rate, this typically costs somewhere between $75-$150. Many, if not most, shops will utilize this diagnosis fee to whatever required repairs if you have them perform the repairs for you. From there, a store volition exist able to give you an accurate guess for repairs to fix your P0138 code.

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Possible Repair Costs for P0138

For error code P0138, i or more than of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the price of the relevant parts and the cost of labor required to brand the repair.

Oxygen sensor $200-$300
Fuel force per unit area regulator $200-$400
Engine coolant temperature sensor $150-$200

DIY Steps to Diagnose Code P0138

If you'd like to try to set lawmaking P0138 at habitation without throwing money at parts, y'all'll want to follow the steps below for proper diagnosis. Diagnosis can require some specialized equipment beyond what the FIXD Sensor can provide, but, on nearly vehicles, this is nevertheless a beginner-level diagnosis and repair for DIYers.

DIY difficulty level: Piece of cake

This repair is easy for beginner DIYers to attempt.

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

FIXD
Multimeter
Fuel pressure level gauge
Vehicle specific service manual

STEP ane: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE Nowadays.

Use FIXD to browse your vehicle to verify P0138 is the only code present. If other codes are present, they must be addressed outset.

Pace 2: Check WIRING AND CONNECTIONS.

Inspect all of the wiring and connectors at the oxygen sensor.

STEP 3: Cheque OXYGEN SENSOR VOLTAGE.

Cheque voltage at the O2 sensor; if the voltage is steadily high (.9V or higher) the O2 sensor may exist faulty. Before replacing, bank check the following:

Verify coolant temperature is reading properly (consult vehicle transmission for specification)
Verify fuel pressure is inside spec.

If the O2 sensor is reading high voltage and the fuel pressure and coolant temperature are within spec, replace the bank 1 downstream O2 sensor.

Pace 5: CONSULT A PROFESSIONAL.

If at this bespeak the vehicle is still setting the same code, you may accept a more serious trouble with your car'southward engine coolant organisation, and y'all should bring the vehicle to a certified shop to have further diagnostic work performed.

Mutual P0138 diagnosis mistakes

It is important to consummate the unabridged diagnostic process when diagnosing P0138. Don't overlook an like shooting fish in a barrel cause such as a loose or damaged connector. Existence so close to the ground and the hot exhaust, the wiring and plastic connectors for the oxygen sensor are susceptible to damage.

Still Need Help Fixing Code P0138?

If y'all've followed the steps above and are still experiencing bug with the coolant temp circuit and lawmaking P0138, please contact the FIXD Mechanic Hotline if yous're a FIXD Premium subscriber or find a RepairPal certified store about you to get the correct repairs at a fair price.

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Source: https://www.fixdapp.com/blog/p0138-code/