Parts for your 2008 Honda Stream-Map sensor

2008 Honda Stream MAP sensor: what it does and how to look after it

Yes, the 2008 Honda Stream uses a MAP (Manifold Absolute Pressure) sensor. Technical sources specific to the Stream RN6–RN9 generation confirm this: the Honda Workshop Manual (Fuel & Emissions, PGM‑FI section) shows a three‑pin MAP sensor on the intake manifold, the Honda Electronic Parts Catalogue lists the MAP sensor under PGM‑FI for R18A and R20A engines, and Honda HDS/OBD‑II diagnostics include MAP‑related DTCs P0105, P0106, P0107 and P0108 for this model. So it’s definitely relevant on this vehicle.

On the 2008 Honda Stream, the MAP sensor tells the ECU how much vacuum (or pressure) is in the intake manifold. That info is used to calculate engine load, which then shapes fuelling, ignition timing, and idle control. It also helps with altitude compensation and smooth cold starts. In short, it’s a core piece of the speed‑density system Honda uses instead of a MAF sensor on these engines.

There’s no fixed replacement interval for the MAP sensor, but it’s smart to inspect it during routine servicing, say every 40,000–60,000 km. Because it’s mounted on the manifold, it can cop a bit of oil mist and carbon over time. Keep an eye on the O‑ring seal, the plastic port, and the three‑pin connector.

• Typical symptoms of a tired MAP sensor: rough idle, flat spots, poor fuel economy, black smoke on tip‑in, and the MIL on with codes P0105–P0108. Fuel trims may be way off in scan data.
• Quick checks: look for vacuum leaks at the manifold, inspect the connector for corrosion, and verify the 5 V reference and ground if you’ve got a multimeter.

Cleaning is fine if the sensor is just a bit gummed up. Use an electronics‑safe sensor cleaner and a light touch—no poking the port with wire. Let it dry completely before refitting. If codes keep returning or readings are implausible in live data, replacement is the go. Fit a quality OEM‑spec sensor, lightly lubricate the O‑ring, seat it squarely, and snug the fasteners to the spec in the workshop manual. After refit, clear codes and let the ECU relearn with a short drive cycle mixing idle, cruise, and gentle acceleration. It’s a straightforward job that pays back with smoother running and better economy—too easy.

• Where is the MAP sensor on a 2008 Honda Stream?
  It’s bolted to the intake manifold near the throttle body, with a three‑pin plug. On R18A and R20A engines it sits high and forward, so access is usually simple with basic tools.
• Can the MAP sensor be cleaned, or should it be replaced?
  If it’s just light contamination, a careful clean with electronics‑safe spray can restore proper readings. If the sensor reports implausible data or the fault returns quickly, replacement is the better call.
• Do I need to perform any reset after replacing the MAP sensor?
  The ECU will generally relearn on its own after a short drive. Clearing any stored codes and letting it idle, then cruising for a few kilometres, helps it settle quickly.