Faulty or contaminated MAP sensor; Vacuum leak in the intake manifold or associated hoses; Damaged or corroded MAP sensor wiring or connector; Clogged or restricted MAP sensor vacuum port; Failed engine control module (ECM) or software issue; Intake manifold carbon buildup affecting sensor readings; Aftermarket air intake or modifications altering sensor signal

DTC codes / Volkswagen codes / P1158

P1158 · VolkswagenManifold Absolute Pressure Sensor Circuit Range Performance

Q: What does code P1158 mean?

Manifold Absolute Pressure Sensor Circuit Range Performance. P1158 on Volkswagen vehicles indicates that the engine control module (ECM) has detected a range or performance problem with the Manifold Absolute Pressure (MAP) sensor circuit. The ECM compares the MAP sensor signal against expected values derived from other sensors such as the throttle position sensor and mass airflow sensor, and it sets this code when the signal falls outside the acceptable range or does not change as expected during specific operating conditions.

P1158 on Volkswagen vehicles indicates that the engine control module (ECM) has detected a range or performance problem with the Manifold Absolute Pressure (MAP) sensor circuit. The ECM compares the MAP sensor signal against expected values derived from other sensors such as the throttle position sensor and mass airflow sensor, and it sets this code when the signal falls outside the acceptable range or does not change as expected during specific operating conditions.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough or unstable idle quality
Hesitation or stumble during acceleration
Reduced engine power or limp mode in some cases
Poor fuel economy or rich-running exhaust smell
Intermittent stalling when coming to a stop

Common causes, most likely first

Faulty or contaminated MAP sensor
Vacuum leak in the intake manifold or associated hoses
Damaged or corroded MAP sensor wiring or connector
Clogged or restricted MAP sensor vacuum port
Failed engine control module (ECM) or software issue
Intake manifold carbon buildup affecting sensor readings
Aftermarket air intake or modifications altering sensor signal

How to diagnose and fix it

Perform a visual inspection of the MAP sensor, its connector, and vacuum hoses for damage or disconnection
Use a scan tool to check live data for MAP sensor voltage and compare it to expected values at key-on, engine-off and at idle
Check for vacuum leaks using a smoke machine or carburetor cleaner while monitoring fuel trims
Test the MAP sensor circuit with a multimeter for reference voltage, ground integrity, and signal return
Clean the MAP sensor port and intake manifold passages if contamination is suspected
Replace the MAP sensor if testing confirms it is out of specification
Clear the fault memory and perform a road test to verify the repair and ensure the code does not return

What the MAP sensor range code hides

A dirty or clogged MAP sensor port is a frequent cause on Volkswagen engines, and cleaning it often resolves the code without replacing the sensor.
Intake manifold vacuum leaks can mimic a faulty MAP sensor because the ECM sees an unexpected pressure reading that falls outside the calculated range.
The ECM may set P1158 even when the MAP sensor itself is good, if the throttle position sensor or mass airflow sensor sends implausible signals that skew the expected MAP value.
Aftermarket performance air intakes or poorly sealed intake components can alter airflow characteristics and trigger this range code on otherwise healthy engines.
Intermittent wiring faults at the MAP sensor connector are common on higher-mileage Volkswagens and may not appear during a simple static test.

Can I keep driving with P1158?

You can usually continue driving with P1158, but avoid aggressive acceleration or heavy loads until the fault is diagnosed, as the engine may enter limp mode or run poorly. If the vehicle exhibits severe drivability issues or stalling, seek professional diagnosis promptly.

Tools that help

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Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.