P1104

Code

LAND ROVER P — Powertrain

Mass or volume of air in the soil damage 2 collector absolute pressure range

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 15 EN: 45 RU: 18

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Page language: EN

Causes

Faulty MAP or MAF sensor (bank/sensor 2)
Damaged or corroded sensor connector or wiring (open, short to ground or power)
Vacuum or intake manifold leak between sensor and engine
Blocked or leaking intake tract (PCV, EGR, intercooler, hoses)
Turbocharger/supercharger boost control fault (wastegate, diverter)
Contaminated MAF sensor (oil, dirt) or wrong sensor calibration

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Rough idle, stalling, or surging
Reduced engine power or poor acceleration
High fuel consumption or black exhaust smoke
Hesitation under load or turbo lag (forced-induction engines)
Difficulty starting in some conditions

What to check

Read freeze-frame and live data (MAF, MAP, intake pressure, engine RPM, load, fuel trims)
Compare MAP and MAF signals for consistency under different engine loads
Inspect sensor connectors and wiring for damage, corrosion, or loose pins
Check for vacuum/intake leaks (visual, smoke test, or boost pressure test)
Inspect and clean MAF sensor if contaminated (use approved cleaner)
Measure sensor supply voltage, ground integrity and signal voltage with engine on

Signal parameters

MAP sensor signal typically 0.5–4.5 V (low at high vacuum, higher with pressure); absolute pressure range ~10–110 kPa depending on altitude
MAF sensor signal typically 0.5–5.0 V or frequency output; expected grams/sec varies with engine and RPM
At idle MAP often ~20–40 kPa (manifold absolute pressure) on naturally aspirated engines
Under wide-open throttle MAP should approach ambient/barometric (~90–105 kPa) or higher with boost
Typical reference supply 5 V and ground; signal should be stable and proportional to load

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data. Note conditions when code set (RPM, load, temp).
With a scan tool, observe live MAP, MAF, intake air temp, fuel trims and compare expected behavior across idle, idle-to-blip, and steady throttle.
Visually inspect sensor, connector and wiring for damage, corrosion, rodent chew or loose pins. Wiggle test while monitoring signal for intermittent changes.
Check sensor reference voltage and ground at the connector with key ON; confirm signal changes with engine revs. Replace wiring repair any faults found.
Perform a smoke test or use methods to find vacuum/intake leaks. Repair any leaks and retest.
If MAF is suspected, safely clean with approved MAF cleaner and re-test. Do not touch sensing element.
If MAP sensor suspected, compare its output to a known-good sensor or use a handheld manometer to verify absolute pressure readings.
Check boost control components on turbo engines (wastegate actuator, boost solenoids, intercooler hoses). Repair/replace as needed.
Clear codes and perform a road test under varied load to confirm if code returns. If persistent, consider sensor replacement.
If replacement sensor still yields code, re-check wiring to ECU and consider ECU/PCM diagnostics or reflash as a last step.

Likely causes

Wiring/connector fault at the MAP/MAF sensor
Faulty MAP or MAF sensor on bank/sensor 2
Intake leak or blocked hose causing abnormal pressure readings
Contaminated MAF element altering mass airflow signal

Fault status

⚠️ Status

Intake air measurement (MAP/MAF) circuit for bank/sensor 2 out of expected range or inconsistent with other intake signals.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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P1104 — Mass or volume of air in the soil damage 2 collector absolute pressure range