Oh, here's the DTC if you're interested.
DTC P1129: MAP Higher Than Expected
1) Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
2) Check the MAP with the scan tool. Is 43.3 kPa (325 mmHg, 12.8 in.Hg) or less indicated? YES - Intermittent failure, system is OK at this time. NO - Replace the MAP sensor.
The Pressure switch is about the same price and also requires 15 minutes of work. There are two, 2nd clutch and 3rd clutch (Honda automatics have seperate clutch packs for each gear. Very unique and delicate.):
2nd Clutch Pressure Switch Replacement
Disconnect the connector from the 2nd clutch pressure switch 20 Nm (2.0 kgf-m. 14 ft. lbs.)
Replace the 2nd clutch pressure switch, then install a new one with a new sealing washer. Tighten the switch on the metal part, not the plastic part.
Reconnect the connector, making sure there is no water, oil, dust, or other foreign particles inside it.
3rd Clutch Pressure Switch Replacement
Disconnect the connector from the 3rd clutch pressure switch.
Replace the 3rd clutch pressure switch, then install a new one with a new sealing washer. Tighten the switch on the metal part, not the plastic part.
Reconnect the connector, making sure there is no water, oil, dust, or other foreign particles inside it.