Powertrain, generic (extended)

P2895 Cylinder 2 Ion Current Sense Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2895 is set when cylinder 2 delivers an ion signal that is electrically intact but does not behave plausibly – for example, it shows almost no combustion peak at normal load, or it scatters strongly from cycle to cycle compared with the neighbouring cylinders. Because the ion current is a direct image of combustion, a genuine problem in cylinder 2 such as a lean injector, a leaking valve or low compression can trigger this code just as well as a dirty plug. That makes it worth reading misfire counters and fuel trims before replacing parts. Saab processes the raw signal with filters that separate the slow combustion part from the fast knock ringing. No manufacturer describes P2895 publicly; electrical faults on cylinder 2 belong to P2894, P2896 and P2897.

Likely causes

Worn or fouled spark plug in cylinder 2
Combustion fault in cylinder 2 (injector, valve, compression)
Coil 2 measuring stage drifting with temperature

Symptoms

  • MIL, sometimes with misfire code P0302
  • Uneven running felt mainly at idle
  • Increased fuel consumption

Repair estimate

DifficultyEasyDIY possible
Parts and labour€30–500
Time0.3–2 h

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

Parts involved

spark plug cyl 2ignition coil cyl 2ion sense module

Related codes

P2894P2896P2897P2891P0302

References: law.cornell.edu, saabwisonline.com, en.wikipedia.org.