P1119 – MAF Sensor In-Range High Failure (manufacturer-specific)

The P1119 is a diagnostic trouble code (DTC) that indicates an issue with the oxygen sensor heating circuit before the catalytic converter on bank 2. When this code is triggered, it's best to have the vehicle diagnosed by a mechanic as soon as possible, as driving with a faulty O2 sensor can lead to increased emissions and reduced fuel economy. However, it is generally safe to drive short distances with a P1119 code as long as other serious symptoms are not present.

Code Details

P1119 specifically points to a malfunction in the heating element of the upstream oxygen sensor on bank 2 (the side of the engine with cylinder #2). The code can be triggered by the powertrain control module (PCM) when it detects an issue with the O2 sensor heater circuit or the sensor itself.

The heated oxygen sensor is a critical emissions component that measures the oxygen content in the exhaust to determine if the air-fuel mixture is running rich or lean. The heating element allows the sensor to quickly reach operating temperature for accurate readings.

While P1119 is a manufacturer-specific code used by some makes like Porsche, similar generic OBD-II codes for O2 sensor heater issues include P0037 and P0038.

Common Causes

A P1119 code can be caused by several factors, including:

• Faulty oxygen sensor heater element or circuit
• Damaged wiring, connectors, or harness to the O2 sensor
• Blown fuse for the O2 sensor heater circuit
• Exhaust leaks near the sensor
• Oil or coolant contamination on the sensor
• Issues with the PCM

Diagnostic Steps

1. Visually inspect the wiring and connectors to the bank 2 upstream O2 sensor for damage, corrosion, or loose connections. Repair as needed.

2. Check for any exhaust leaks near the sensor that could allow outside air to enter and skew the readings. Repair leaks if found.

3. With a multimeter, test for 12V power and ground at the O2 sensor heater pins. If voltage is not present, check for blown fuses or open circuits.

4. Measure the resistance of the O2 sensor heater. It should be between 5-7 ohms at room temperature. Replace the sensor if resistance is out of spec.

5. If all circuits test okay, try swapping the bank 1 and bank 2 upstream sensors. If the code changes to P1117 (bank 1), the original sensor is likely faulty.

6. As a last resort, a malfunctioning PCM could be at fault if no other issues are found.

Repair Solutions

• If wiring damage is found, splice in new pigtails or replace the harness as needed. Ensure all connections are secure.

• Replace the upstream oxygen sensor on bank 2 if it fails resistance or functionality tests.

• Seal any detected exhaust leaks that could allow unmetered air to reach the sensor.

• In rare cases, a faulty PCM may need to be reprogrammed or replaced if it is not properly controlling the O2 heater circuit.

While oxygen sensor replacement is usually straightforward, it's best to have the repair performed by a professional mechanic to ensure the job is done correctly and the code is properly cleared.

Repair Costs

The cost to diagnose and repair a P1119 code can vary depending on the root cause and the make and model of the vehicle. On average, expect to pay anywhere from $100-300 USD (€90-270 EUR) for diagnosis and testing.

If the oxygen sensor needs to be replaced, parts alone typically run $150-500 USD (€135-450 EUR) depending on the brand and whether an OEM or aftermarket sensor is used. Labor rates at a repair shop are typically $80-150 per hour ($70-135 EUR), and the job usually takes 1-2 hours.

For wiring repairs, costs can range from $100-300 USD (€90-270 EUR) depending on the extent of the damage and time required. PCM replacement is rare but very costly, often exceeding $1000 USD (€900 EUR) for parts and labor.

Prevention Tips

To help prevent oxygen sensor issues that can lead to a P1119 code:

• Have the O2 sensors replaced according to the manufacturer's recommended service interval, usually every 60,000-100,000 miles (96,000-160,000 km).

• Address any exhaust leaks immediately to prevent unmetered air from causing inaccurate sensor readings.

• Use high-quality fuel and change the oil regularly to minimize contaminants that can damage the sensors over time.

• Avoid using aftermarket air intakes or exhaust systems that could alter the air-fuel ratio and cause issues with the O2 sensors.

Related Issues

Other symptoms that may appear along with a P1119 code include:

• Rough idle or misfires
• Reduced fuel economy
• Increased tailpipe emissions
• Illuminated check engine light

Related codes that may occur in conjunction with P1119 include:

• P0037 (Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2)
• P0038 (Oxygen Sensor Heater Control Circuit High Bank 1 Sensor 2)
• P0137 (O2 Sensor Circuit Low Voltage Bank 1 Sensor 2)
• P0138 (O2 Sensor Circuit High Voltage Bank 1 Sensor 2)

By promptly addressing a P1119 code with proper diagnosis and repair, you can restore your vehicle's emissions system performance and avoid potential engine damage down the road.

Frequently Asked Questions About P1119

What does the P1119 code mean?

The P1119 code indicates a problem with the oxygen sensor heater circuit for the upstream O2 sensor on bank 2 (the side of the engine with cylinder #2). It means the powertrain control module (PCM) has detected an issue with the sensor's heating element or wiring.

Is it safe to drive with a P1119 code?

It is generally safe to drive short distances with a P1119 code as long as no other serious symptoms are present. However, driving with a faulty O2 sensor for extended periods can lead to increased emissions, reduced fuel economy, and potential catalytic converter damage, so it's best to have the issue diagnosed and repaired promptly.

What are the common symptoms of a P1119 code?

Common symptoms that may accompany a P1119 code include:

• Illuminated check engine light
• Rough idle or misfires
• Reduced fuel economy
• Failed emissions test

In many cases, there may be no noticeable symptoms other than the stored code.

What causes a P1119 code?

A P1119 code can be triggered by several issues, such as:

• Faulty oxygen sensor heater element
• Damaged wiring or connectors to the O2 sensor
• Blown fuse for the O2 sensor heater circuit
• Exhaust leaks near the sensor
• PCM issues

How do you diagnose a P1119 code?

To diagnose a P1119 code:

1. Visually inspect the wiring and connectors to the bank 2 upstream O2 sensor for damage.
2. Check for exhaust leaks near the sensor.
3. Test for power and ground at the sensor heater wires.
4. Measure the resistance of the O2 sensor heater.
5. Swap the bank 1 and bank 2 sensors to isolate the fault.
6. Check the PCM if no other issues are found.

Can a blown fuse cause a P1119 code?

Yes, a blown fuse that supplies power to the oxygen sensor heater circuit can trigger a P1119 code. Check the fuse box for any blown fuses related to the O2 sensors and replace as needed.

How much does it cost to fix a P1119 code?

The cost to repair a P1119 code varies depending on the cause. Oxygen sensor replacement typically costs $250-600 for parts and labor. Wiring repairs may run $100-300, while a PCM replacement can exceed $1000. Diagnostic fees are usually $100-200.

Can I replace the oxygen sensor myself?

Replacing an oxygen sensor is a job that can be done by a skilled DIYer with the proper tools. However, it's important to follow the manufacturer's instructions and torque specifications. If you are unsure, it's best to have the repair performed by a professional mechanic.

How often should oxygen sensors be replaced?

Oxygen sensors are typically replaced every 60,000 to 100,000 miles as part of routine maintenance. However, they may fail prematurely due to contamination, wiring issues, or other factors.

Can aftermarket parts cause a P1119 code?

In some cases, installing aftermarket air intake or exhaust parts that alter the air-fuel ratio can lead to oxygen sensor issues and trigger a P1119 code. It's best to use OEM or high-quality aftermarket parts that are designed for your specific vehicle.

What other codes may appear with a P1119?

Related codes that may appear alongside a P1119 include:

• P0037 (O2 Sensor Heater Circuit Low Bank 1 Sensor 2)
• P0038 (O2 Sensor Heater Circuit High Bank 1 Sensor 2)
• P0137 (O2 Sensor Circuit Low Voltage Bank 1 Sensor 2)
• P0138 (O2 Sensor Circuit High Voltage Bank 1 Sensor 2)

These codes all relate to the post-catalytic converter oxygen sensor on bank 1.

Can a P1119 code cause damage to the catalytic converter?

Yes, driving for extended periods with a faulty oxygen sensor can lead to an improper air-fuel mixture, which may cause the catalytic converter to overheat and suffer premature failure. Prompt repairs can help avoid this costly damage.

Will clearing the code fix the problem?

No, simply clearing the P1119 code will not fix the underlying issue. The code will likely reappear until the faulty component is repaired or replaced. Proper diagnosis is needed to determine the root cause.

What is the difference between P1119 and P0037?

P1119 is a manufacturer-specific code used by some makes like Porsche, while P0037 is a generic OBD-II code. However, both codes relate to the oxygen sensor heater circuit for the downstream O2 sensor on bank 1.

Can a malfunctioning oxygen sensor cause poor fuel economy?

Yes, a failing oxygen sensor can cause the engine to run too rich or too lean, which can lead to increased fuel consumption and reduced gas mileage. Replacing a faulty O2 sensor can often improve fuel economy.

What tools are needed to diagnose a P1119 code?

To properly diagnose a P1119 code, you may need:

• OBD-II scanner
• Digital multimeter
• Wiring diagrams
• Vehicle service manual
• Basic hand tools

Having access to a lift can also make the job easier, especially when checking for exhaust leaks.

Can carbon buildup cause a P1119 code?

Yes, carbon buildup on the oxygen sensor from oil blow-by or a rich running condition can insulate the sensor and cause it to fail, triggering a P1119 code. Cleaning the sensor may temporarily resolve the issue, but replacement is often necessary.

How long does it take to replace an oxygen sensor?

Replacing an oxygen sensor typically takes 1-2 hours, depending on its location and accessibility. In some cases, the exhaust system may need to be partially disassembled to gain access to the sensor.

Can a P1119 code affect vehicle performance?

In most cases, a P1119 code will not have a significant impact on engine performance. However, if left unrepaired, it can lead to increased emissions, reduced fuel economy, and potential catalytic converter damage over time.

What should I do if a P1119 code keeps coming back?

If a P1119 code persists even after replacing the oxygen sensor, there may be an underlying issue with the wiring, PCM, or other components. It's best to have the vehicle thoroughly diagnosed by a professional mechanic to identify and resolve the root cause.