P0491 Trouble Code

View P0491 obd/2 error code description and symptoms. P0491 engine photo

Mass Air Flow (MAF) Sensor Intermittent The MAF sensor circuit is monitored by the PCM for sudden voltage (or air flow) input change through the comprehensive component monitor (CCM). If during the last 40 warm-up cycles in key ON engine running the PCM detects a voltage (or air flow) change beyond the minimum or maximum calibrated limit, a continuous memory diagnostic trouble code (DTC) is stored.

On some transmissions, such as automated manual transmissions or automatic transmissions with manual mode, the GSP switch lets the TCM know whether or not the driver has selected automatic or manual function. On manual transmissions, the GSP switch informs the TCM which gear the driver is selecting, and may function as a neutral safety switch, depending on system design. The TCM also uses the gate select position switch to monitor transmission operation. For example, if the driver selects manual mode and selects 3rd gear on an automatic transmission, the TCM may monitor speed sensors to detect clutch and brake slippage.

P0491 Error Code Repair Process :

The scent may P0491 signal oil or coolant leaking from their normally closed-loop systems, or it may indicate dangerous exhaust gases invading your car's interior. Car and truck exhaust contains toxic gases such P0491, so if the inside of your car p0491 secondary air injection system insufficient flow bank 1 as if you were standing behind your car, get out and get it fixed. Fight the urge to take a little nap first. So sleepy. That's the carbon monoxide talking, friends. At least open a window on your way to the shop.

P0491 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

Common Causes of P0491

A common cause of code P0491 is the failure of P0491 Secondary Air Injection System Insufficient Flow Bank 1, but there are several other possible causes as well, such as ;

Damaged camshaft position (CMP) sensor
Clogged or faulty fuel injector (s)
EVAP system hose leaking
Fuel Injectors circuit poor electrical connection

P0491 code for all cars

You can view according P0491 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+P0491 Mercedes 122f 16hp

+P0491 Datsun Skyline

+P0491 Beijing Bj 2021

+P0491 Scion Xd

+P0491 Allard Palm Beach

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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