Hi just purchased a 2013 Accord Lx 2.4l 90k miles and everything was fine until yesterday. I noticed when the engine is cold it would stutter/shake a little when I gave it gas. Once it was up to normal temp , it runs fine and no problems. No CEL but I did hook up my Bluetooth reader and have 3 pending codes. P011B , P1128 ,P1129 . Looked up the P1128/P1129 codes and both state Map sensor so I ordered a new map sensor that won't be here until next week to see if that fixes the problem but now what are a few things i should try to dix P011B . Checked my coolant ,fans and water pump. Everything seems fine no leaks and level is good. Could P011B be related to the Map? Any steps I can take while waiting for the new sensor? Sorry for the long post and Thank you in advance. Any help greatly appreciated

 

Trouble codes do not necessarily mean a sensor is faulty. Therefore, just because P1128 and P1129 are present does not mean it is due to the MAP sensor being bad.

Generally, trouble codes help narrow down the areas or causes of what is causing the fault.

DTC P011B - :Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem
Two engine coolant temperature (ECT) sensors and one intake air temperature (IAT) sensor are used by the powertrain control module (PCM). When the engine is stopped and enough time has passed, the temperature of the engine will equalize to ambient temperature. ECT sensor 1 and IAT sensor are compared to ECT sensor 2, and if an inappropriate temperature is read, the PCM detects a malfunction in the corresponding sensor and stores a DTC.

Possible Cause
ECT sensor 1 failure
ECT sensor 2 failure
IAT sensor failure
Engine block heater attachment (besides a genuine part)

DTC P1128:Manifold Absolute Pressure (MAP) Sensor Signal Lower Than Expected
Possible Cause
MAP sensor output signal low
Intake air system clogged

DTC P1129:Manifold Absolute Pressure (MAP) Sensor Signal Higher Than Expected
Possible Cause
MAP sensor output signal high
Evaporative emission (EVAP) canister purge valve failure
Valve timing incorrect
Intake air system air leak

Since the air intake system being possibly related to all three trouble codes, you should check the air intake system (e.g., filter, intake system for clogs or leaks, MAF/IAT sensor, etc.). It could be due to something else; but, air intake system is a possible commonality.

 

Thank you for reply . Filter was replaced a month ago and still looks . While looking thru my map graph, barometric was around 100 while my map was jumping between 27 to 30. Figured since the map sensor is only 66 from The Honda dealer i i xan try it out . I will disconnect the air intake today and see if I find something