What Would Cause 2003 Exterra 02 Sencor Code to Read High Voltage

What Does Code P0138 Mean?

P0138 definition: O2 Sensor Circuit High Voltage (Bank 1, Sensor two)
Outcome Severity: MODERATE – Extended driving with this code can crusade internal engine damage.
Repair Urgency: Become this lawmaking stock-still withing the side by side month to forbid internal engine damage.
Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0138 code. This DTC can be triggered past a faulty oxygen sensor or wrong fuel force per unit area.

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Oxygen sensor ii is the downstream oxygen sensor in relationship to the catalytic converter. It measures the amount of air and fuel coming out of the catalytic converter to ensure the catalytic converter is functioning properly. If the voltage is loftier (approx. .9V) in that location is an excess of fuel in the mixture. If the voltage is low (approx. .1V) then in that location is an backlog of air in the mixture. Therefore, the downstream oxygen sensor (sensor two) should produce a steady voltage of approximately 0.45 volts. When trouble code P0138 is set, this indicates that at that place is a loftier voltage (steadily above .nine volts) for more than x seconds indicating a lack of oxygen in the exhaust stream and an abundance of fuel at sensor 2 on the banking company i of the engine.

P0138 Causes

Faulty O2 Sensor
Short to battery voltage in O2 sensor indicate circuit
Corroded wiring
Fuel pressure likewise high
Engine coolant temperature sensor

P0138 Symptoms

Bank check Engine Low-cal
Engine runs rich
Lower fuel economic system
Rough idle
Potent fumes

How Do I Fix Code P0138?

With a P0138 code, the first step is to get information technology properly diagnosed to effigy out what is causing the malfunction in the oxygen sensor voltage. Using the alive data part of the FIXD sensor and app allows you to read and analyze inputs from the oxygen sensor to properly diagnose a P0138 code. If yous're not comfortable diagnosing this issue further at home, we recommend finding a RepairPal-certified shop to pinpoint the problem and give an authentic estimate for repairs.

These shops can not only help you figure out what's going wrong earlier you waste product time and coin on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand up behind all their estimates with guaranteed off-white pricing.

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How Much Does It Cost to Fix Code P0138?

If you lot accept your car to a shop for diagnosis, near shops will start with an hr of "diag time" (the time spent in labor diagnosing your specific issue). Depending on the store'south labor rate, this typically costs somewhere between $75-$150. Many, if non most, shops will apply this diagnosis fee to any required repairs if you lot have them perform the repairs for y'all. From at that place, a shop will be able to give you an accurate estimate for repairs to fix your P0138 code.

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Possible Repair Costs for P0138

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

Oxygen sensor $200-$300
Fuel pressure regulator $200-$400
Engine coolant temperature sensor $150-$200

DIY Steps to Diagnose Code P0138

If y'all'd like to try to set up code P0138 at dwelling without throwing coin at parts, you'll want to follow the steps beneath for proper diagnosis. Diagnosis can require some specialized equipment beyond what the FIXD Sensor can provide, but, on virtually vehicles, this is still a beginner-level diagnosis and repair for DIYers.

DIY difficulty level: Easy

This repair is easy for beginner DIYers to attempt.

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

FIXD
Multimeter
Fuel pressure approximate
Vehicle specific service manual

STEP i: Apply FIXD TO ENSURE NO OTHER ENGINE CODES ARE Present.

Use FIXD to scan your vehicle to verify P0138 is the merely lawmaking present. If other codes are nowadays, they must be addressed first.

STEP ii: CHECK WIRING AND CONNECTIONS.

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

STEP 3: Cheque OXYGEN SENSOR VOLTAGE.

Bank check voltage at the O2 sensor; if the voltage is steadily high (.9V or higher) the O2 sensor may be 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 level and coolant temperature are within spec, supersede the bank 1 downstream O2 sensor.

STEP 5: CONSULT A Professional person.

If at this point the vehicle is still setting the same code, you may take a more than serious problem with your automobile's engine coolant system, and you should bring the vehicle to a certified shop to accept further diagnostic work performed.

Common P0138 diagnosis mistakes

Information technology is of import to complete the entire diagnostic process when diagnosing P0138. Don't overlook an easy cause such as a loose or damaged connector. Beingness and then close to the ground and the hot exhaust, the wiring and plastic connectors for the oxygen sensor are susceptible to harm.

Still Demand Help Fixing Lawmaking P0138?

If you've followed the steps in a higher place and are still experiencing issues with the coolant temp circuit and code P0138, delight contact the FIXD Mechanic Hotline if you're a FIXD Premium subscriber or observe a RepairPal certified shop nearly yous to get the correct repairs at a fair price.

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