Parts for your 2015 Lexus Is-Map sensor

2015 Lexus IS MAP sensor: what’s fitted and what to know

Based on the Lexus/Toyota Repair Manual (TIS) and the Lexus Electronic Parts Catalogue (EPC) for the 2015 IS range, whether a MAP sensor is relevant depends on the variant. The IS250 (4GR-FSE) and IS350 (2GR-FSE) are shown with a Mass Air Flow (MAF) meter and no separate manifold absolute pressure sensor listed. The IS300h (2AR-FSE hybrid) is listed with a Manifold Absolute Pressure sensor (often labelled “No.1 Vacuum Sensor”) mounted on the intake manifold, and its diagnostic list includes MAP-related DTCs such as P0106–P0108.

Why some models don’t use one: the naturally aspirated V6 IS250/IS350 engines are calibrated around the MAF sensor for primary load measurement, supported by throttle position and oxygen sensors. In these engines a discrete MAP sensor isn’t required for the control strategy, so it isn’t fitted according to the service and parts documentation. By contrast, the IS300h’s Atkinson-cycle four-cylinder with EGR relies on a MAP signal for accurate load and EGR flow control, so it gets one from factory.

For IS300h owners, the MAP sensor does a quiet but crucial job. It measures absolute pressure inside the intake manifold, letting the ECU calculate how much air the engine is actually drawing under different conditions — idle, cruising, and when EGR is flowing. That helps nail fuel delivery, spark timing and hybrid blending so the car feels smooth, frugal and clean. If the MAP sensor goes out of whack, expect lazy throttle response, rough idle, a hit to fuel economy and a check engine light. Common fault codes include P0106 (range/performance), P0107 (low) and P0108 (high).

There’s no scheduled replacement for the MAP sensor — it’s a solid-state part — but a bit of preventative care goes a long way. Under the bonnet, make sure the connector is clean and the harness isn’t chafed. If the sensor port has oily soot from EGR, a gentle clean of the port can help readings stabilise. Avoid drowning it in harsh solvents, a light application of sensor-safe cleaner and a soft brush on the port is plenty. If replacement is needed, stick with quality OEM-equivalent parts, swap the O-ring, and seat it squarely. No coding is required, after installation, clear codes and let the ECU relearn. A quick check with a scan tool helps: with ignition on and engine off, MAP should read close to local barometric pressure, at warm idle it should drop noticeably. Don’t confuse the MAP with the MAF up at the airbox — they’re different jobs. If in doubt, a technician with Toyota/Lexus diagnostic gear can confirm the fault in minutes.

• Quick checks: inspect connector and O-ring, verify live MAP kPa versus BARO, look for P0106–P0108.
• Replacement tips: use sensor-safe cleaner on the port only, avoid over-tightening, clear codes and road test.

Technical sources referenced: Lexus/Toyota Repair Manual (TIS) for 2015 IS (Engine/Hybrid Control sections) and Lexus Electronic Parts Catalogue (EPC) listings for IS250/IS350 (no discrete MAP sensor) and IS300h (MAP/No.1 Vacuum Sensor fitted).

Popular questions

Does a 2015 Lexus IS have a MAP sensor?
The IS300h does — it’s mounted on the intake manifold and supports load and EGR control. The IS250 and IS350 use a MAF-based strategy and do not list a separate MAP sensor in the Lexus EPC or TIS manuals for this model year. Always check the VIN-specific parts listing if unsure.

What are the symptoms of a bad MAP sensor on an IS300h?
Drivers may notice sluggish acceleration, a rough or hunting idle, increased fuel use and a check engine light. Scan tools commonly show P0106, P0107 or P0108. Live data may reveal implausible manifold pressure that doesn’t track barometric pressure KOEO or engine load changes.

Can the MAP sensor be cleaned or does it need replacing?
Light cleaning of the sensor port and checking the connector/O-ring can restore stable readings if contamination is minor. If the sensor flags persistent DTCs or live data stays erratic after checks, replacement is the reliable fix. No programming is needed — clear codes and allow a short relearn drive.