O2 Heater element resistance is high; Internal short or open in the heater element; O2 heater circuit wiring high resistance; Open or short to ground in the wiring harness

Read the code and live data with an OBD-II scanner; Look for exhaust or vacuum leaks and check the wiring of the sensor or valve; Test the part before replacing it; Fix the cause, clear the code and test-drive

P0135 on Honda City GM2: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

Short answer: P0135 means “O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)”. The car’s computer has found a fault in the Emissions system and turns on the Check engine light (MIL). First check: read the code and live data with an OBD-II scanner.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code: P0135
System: Emissions
Dashboard light: Check engine light (MIL)
Applies to: Generic OBD-II meaning. Not every code is used by this car.
Confidence: medium (generic OBD-II definition, not checked against the factory manual for this car)
Source: obd-codes.com

Symptoms and when it is set

Check engine light on

Likely causes

O2 Heater element resistance is high
Internal short or open in the heater element
O2 heater circuit wiring high resistance
Open or short to ground in the wiring harness

What to check, in order

Read the code and live data with an OBD-II scanner
Look for exhaust or vacuum leaks and check the wiring of the sensor or valve
Test the part before replacing it
Fix the cause, clear the code and test-drive

Related on this car

Same code on other cars

← P0134 P0136 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.