← View Generic P0135 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0135: Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 1

on 2021 Honda PASSPORT

Fix Cost
$50 - $250
Parts & Labor
Difficulty
2/5
30 mins - 1 hour
DIY Possible?
✅ Yes
Save money
Your Vehicle
2021 Honda
PASSPORT
⚠️

Important for 2021 Honda PASSPORT Owners

Before starting repairs, verify which engine your 2021 Honda PASSPORT has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0135 Mean on 2021 Honda PASSPORT?

The heater circuit for the upstream oxygen sensor on bank 1 is not working properly.
⚠️

Symptoms

  • • Slow warm-up of oxygen sensor
  • • poor fuel economy when cold
  • • check engine light
  • • failed emissions test.
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Common Causes

  • • Blown fuse for oxygen sensor heater
  • • faulty oxygen sensor with bad heater
  • • wiring problems to heater circuit.
🛠️

How to Fix P0135 on 2021 Honda PASSPORT

Check and replace oxygen sensor heater fuse, replace oxygen sensor if heater is internal, repair heater wiring.

🔧

Need Maintenance Info for Your PASSPORT?

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View 2021 Honda PASSPORT Specs

Parts for 2021 Honda PASSPORT

Oxygen Sensor Shop ↗ O2 Sensor Socket Shop ↗

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Related Diagnostic Codes

Other codes that may appear with P0135

P0130 Same System

Oxygen Sensor Circuit Malfunction Bank 1 Sensor 1

Medium
P0131 Same System

Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 1

Medium
P0132 Same System

Oxygen Sensor Circuit High Voltage Bank 1 Sensor 1

Medium
P0133 Same System

Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1

Medium
P0134 Same System

Oxygen Sensor Circuit No Activity Detected Bank 1 Sensor 1

Medium
P0420 Related Problem

Catalyst System Efficiency Below Threshold Bank 1

Medium

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system