Toyota code

Toyota P1155 Code: Meaning, Causes, Symptoms, and Repair Cost

For Toyota vehicles, P1155 points to Air/fuel ratio sensor heater circuit bank 2. The code should be diagnosed with vehicle-specific component names, connector locations, and live data instead of assuming the generic repair is automatically

Severity: Medium

Typical repair: $150-$850

Last reviewed: 2026-05-11

Make-specific meaning

Can I drive?

Short local driving may be possible if the vehicle runs normally, but diagnose soon and stop if the light flashes or severe symptoms appear.

Repair range

$150-$850

How This Differs From The Generic Code

Toyota bank-specific air/fuel sensor heater checks change connector, fuse, and sensor-side diagnosis.

Make-Specific Causes

Make-specific sensor or actuator failure35%

Connector corrosion or harness damage near the affected component25%

Known vacuum exhaust or EVAP leak pattern for this make18%

Incorrect live data caused by an upstream engine fault14%

Control module power ground or fuse issue8%

Symptoms

Check engine light
Rough idle or hesitation
Reduced fuel economy
Failed emissions readiness

Diagnostic Steps

1Confirm the code with a scanner that can show live data
2Verify the make-specific component and bank location
3Inspect connectors hoses wiring and fuses for this make
4Compare live data to expected warm-up or operating behavior
5Repair the proven fault and complete a drive cycle retest

P0135 P0420 Toyota P1135 Toyota

FAQ

Is Toyota P1155 different from the generic code?

It can be. The code number may overlap, but component naming, likely causes, and test order can differ by make.

Can I drive with Toyota P1155?

Usually only for short trips if the vehicle runs normally. Stop if the light flashes, the engine overheats, or power drops.

Why does this page need make-specific content?

A manufacturer page should add make-specific causes, checks, or repair context. Otherwise it should remain draft or paused.