Powertrain, generic (extended)

P2436 AIR System Air Flow/Pressure Sensor Circuit Range/Performance (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2436 says the bank 2 secondary air pressure reading is electrically valid but does not match what the system expects. Audi documents the code on the 2017 R8 and R8 Spyder V10: bulletin 2049142 (TSB group 01, 18-56) pairs P243600 with P243700 and has the bank 2 pressure sensor G610 replaced, following the guided fault finding. GM's 2018 tables note that the barometric-quality weighting used for P2431 also applies to P2436, but only on engines with two valves. As on bank 1, the reading is usually compared with ambient pressure with the pump off and on; a drifting sensor, a clogged sensing port or a wrong baro value can all trip it. P2431 is the bank 1 code; P2437/P2438 are the electrical faults.

Likely causes

Bank 2 pressure sensor drifted or failed (Audi R8 replaces G610)
Sensing port or hose on bank 2 clogged or leaking
Wrong barometric reference value

Symptoms

  • Check engine lamp
  • Often stored together with P2437
  • Secondary air readiness incomplete

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–500
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

air system flow sensor b2sai wiring

Related codes

P2431P2435P2437P2438

References: static.nhtsa.gov, gsi.ext.gm.com.