P2040

Reductant Injection Air Pressure Sensor A Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Unstable engine operation
Possible transition to emergency mode

Causes

Air pressure sensor malfunction
Open or short circuit in the sensor circuit
Problems with the wiring harness or connectors
Control module malfunction
Dirty or clogged air passages

How to Fix

Check the integrity of the sensor circuit
Inspect connectors and wiring harness for damage
Check the functionality of the air pressure sensor
Clean or replace sensor if necessary
Check and, if necessary, replace the control module

Related codes

P203F P2041 P2042