P2195 fault code: O2 Sensor Signal Stuck Lean

P2195 means “O2 Sensor Signal Stuck Lean” — an extended powertrain range fault in the powertrain.

Can I DIY?

Professional-only boundary. You may confirm P2195 on a scanner; replacing an oxygen sensor is not published as a home job here.

Do not DIYReviewed page boundary
ToolsSpecialist equipment

This is the conservative boundary from the reviewed code record. This page has no frozen site-wide safety grade, so it does not publish a repair route.

What to tell the garage about P2195

Do not drive until checked. An oxygen sensor signal is stuck reporting a lean mixture instead of switching as the fueling changes. That is a stuck-signal fault, not a catalyst-efficiency diagnosis and not a home parts-replacement job.

Take these reviewed, code-specific details with you. They help the garage confirm the fault without turning this page into a repair procedure.

  • O2 Sensor Signal Stuck Lean: Registration number
  • O2 Sensor Signal Stuck Lean: Exact code P2195 and any companion codes
  • O2 Sensor Signal Stuck Lean: Whether the engine management light is steady or flashing
  • O2 Sensor Signal Stuck Lean: Whether live oxygen or AFR data stayed fixed on the lean side
  • O2 Sensor Signal Stuck Lean: That no oxygen sensor or catalyst has been replaced from this page
P21xxExtended powertrain range
MOT fail riskif the warning light stays on

What does P2195 mean?

P2195 is a powertrain code from the extended SAE range reported by your car’s engine control unit. It sits in the P21xx block, which covers extended powertrain range. The stored description is “O2 Sensor Signal Stuck Lean”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P2195 fail an MOT?

An illuminated engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. A stuck oxygen-sensor signal can also disturb the exhaust emissions test.

Before booking your test, check what usually fails on your car: see our MOT pass rates by make and model, built from 33.1 million DVSA tests.

Related guides

Car diagnostic test cost: compare the scopeUK booking marketplaces currently publish diagnostic averages of about £52–£65. Engine management light on: steady or flashing?A steady engine management light means the computer has stored a fault. Drive with caution and get the code read. A flashing light is different — stop when it is safe.
P2100Throttle Actuator Control Motor Circuit/Open P2101Throttle Actuator Control Motor Circuit Range/Performance P2102Throttle Actuator Control Motor Circuit Low P2103Throttle Actuator Control Motor Circuit High P2104Throttle Actuator Control System - Forced Idle P2105Throttle Actuator Control System - Forced Engine Shutdown P2106Throttle Actuator Control System - Forced Limited Power P2107Throttle Actuator Control Module Processor

P2195 — quick answers

Is it safe to drive with P2195?

Do not drive until checked. We have no verified driving guidance for P2195. Treat as do not drive until a garage has checked it. This page will not guess a milder class from other oxygen-sensor or fuel-trim codes.

Will P2195 fail my MOT?

An illuminated engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. A stuck oxygen-sensor signal can also disturb the exhaust emissions test.

Fault-code identifiers are standard diagnostic facts. Their explanations and diagnostic guidance on this site are original editorial summaries, not reproduced SAE wording. MOT defect rules reflect the DVSA MOT inspection manual (2026). This page is general guidance for UK drivers, not a substitute for a professional diagnosis.