CC
CarCodeFix
P0135Medium Priority

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

Category: Powertrain• Fuel and Air Metering

50 articles · 4 makes affected

What is P0135?

P0135 indicates a problem with the oxygen sensor heater circuit on Bank 1 Sensor 1, which is the upstream sensor before the catalytic converter. This is a medium-severity powertrain code that can trigger the check engine light and may affect fuel economy and emissions. Based on real data, this code is most frequently reported in Ford Mustang, Honda Accord, and Toyota 4Runner models.

Common Causes

  • ●Faulty oxygen sensor heater element (most common cause)
  • ●Damaged wiring or connectors in the sensor circuit
  • ●Blown fuse or relay for the oxygen sensor heater circuit

Symptoms You May Notice

  • ●Check engine light illuminated on dashboard
  • ●Potential decrease in fuel economy
  • ●Possible rough idle or hesitation during acceleration

How to Fix It

  • ●Replace the upstream oxygen sensor (Bank 1 Sensor 1) ($150-$400, moderate difficulty)
  • ●Repair damaged wiring or connectors in the sensor circuit ($100-$300, moderate difficulty)
  • ●Replace blown fuse or relay for the heater circuit ($20-$80, easy difficulty)

Root Causesfor P0135

Based on 9 owner reports

What Didn't Help

Repairs that owners tried but didn't fix the issue

startingf catalysts deficiency codes. i changed the o2 sensor andgenius when it comes to troubleshootingknow if they were previously existing codesnning issue but cleared all but one code (p0135). aftero2 sensor sensor and

Things to Check

Suggested areas to investigate based on similar cases

issueroot of this problem(low rpm) **i drive a 2002 honda accord coupe f23 2

Owner Statistics

Based on 415,904 real owner discussions • 11389 confirmed solutions

Dataset (415,904 records)
$2,654
Average Repair Cost
3%
Success Rate
24%
DIY Repairs
415,904
Data Sources

About This Data

Statistics are aggregated from real owner discussions on Reddit, automotive forums, and YouTube comments. All data is anonymized and represents actual repair experiences reported by vehicle owners.

Frequently Appears With

These codes often appear together in owner reports. Check these if you see P0135.

Based on analysis of 18 owner reports where multiple codes appeared together.

Issues by Vehicle

FORD

2010 Mustang

2010 Ford Mustang Misfire? How to Fix it with a PCV Valve

63 sources
2010 Expedition

How to Fix a Clicking Noise on Your 2010 Ford Expedition

100 sources
2020 Mustang

2020 Ford Mustang: Power Steering Problems? Check Fuse 47 First!

251 sources
2020 Mustang

2020 Ford Mustang Intake Leak? Causes, Symptoms & DIY Fix

133 sources
2020 Mustang

How to Fix an Exhaust Manifold Leak on Your 2020 Ford Mustang

263 sources
2020 Mustang

2020 Ford Mustang Intake Manifold Leak? Here's How to Fix It

177 sources
2020 Mustang

Why Your 2020 Ford Mustang Keeps Blowing Fuses

112 sources
2020 Mustang

2020 Ford Mustang: What Causes Valve Cover Smoke?

143 sources
2020 Mustang

How to Fix a 2020 Ford Mustang Intake Manifold Coolant Leak

245 sources
2020 Mustang

How to Fix Stuttering and Hesitation in Your 2020 Ford Mustang (Fuel Injector Guide)

308 sources
2010 Expedition

2010 Ford Expedition Check Engine Light: Diagnosing Fuel System Issues

100 sources
2010 Expedition

How to Fix a 2010 Ford Expedition Misfire

100 sources
2010 Mustang

2010 Ford Mustang Stalling? How to Fix Throttle Body Issues

59 sources
2010 Mustang

2010 Ford Mustang Throttle Body Problems? PCV Valve Fix Guide

91 sources
2020 Mustang

Stop the Clicking: How to Diagnose and Fix Mustang Relay Problems

144 sources
2010 Mustang

2010 Mustang Fuse Keeps Blowing? Here's How to Fix It

93 sources
2020 Mustang

Stop Your Mustang's Oil Leak: The Real PCV System Fix

345 sources
2020 Mustang

2020 Ford Mustang Turbo Lag? How to Fix PCV Valve Issues

121 sources
2010 Mustang

Why Your 2010 Mustang Cranks But Won't Start (MAF Sensor Guide)

134 sources
2020 Mustang

Why Your 2020 Mustang is Knocking and Stalling (It's Probably Not the Head Gasket)

988 sources
2020 Mustang

Fixing a Coolant Leak Near Your Mustang's Exhaust Manifold

624 sources
2010 Expedition

Why Your 2010 Expedition Gets Bad Gas Mileage (And How to Fix It)

100 sources
2020 Mustang

Why Your 2020 Mustang Loses Power and Shifts Poorly (It's Not the Transmission)

265 sources
2020 Ranger

Why Your Ford Ranger Lurches When Starting (And How to Fix It)

124 sources
2020 Mustang

Stop Mustang Vibration: Fixing the Real PCV and Vacuum Leak Problem

85 sources
2020 Mustang

Stop Your Mustang's Coolant Leak: The Real Intake Problem Owners Find

1.3K sources
2020 Ranger

Why Your Ford Ranger Idles Rough and How to Fix It

104 sources
2020 Mustang

Why Your 2020 Mustang Has a Whining Noise and Rough Idle (PCV System Fix)

106 sources

HONDA

2010 Accord

Why Your 2010 Honda Accord Stalls (and How to Fix It)

135 sources
2020 Accord

2020 Honda Accord Misfire and Idle Surge? Intake Troubleshooting

119 sources
2010 Accord

2010 Honda Accord Shift Solenoid Issues: Diagnosis and Repair

77 sources
2020 Accord

Is Your 2020 Honda Accord Alternator Failing? Here's How to Know and Fix It

109 sources
2020 Accord

Fixing a Failing CVT in Your 2020 Honda Accord

486 sources
2010 Accord

How to Diagnose and Fix a Blown Fuse in Your 2010 Honda Accord

81 sources
2010 Accord

Is Your 2010 Honda Accord Transmission Slipping? Here's Why and How to Fix It

251 sources
2020 Accord

How 2020 Accord Owners Fixed O2 Sensor and Check Engine Lights

81 sources
2010 Accord

How to Diagnose and Fix an Intake Manifold Leak on Your 2010 Accord

122 sources
2020 Accord

Fixing Your Accord's Cold Start Noise and Misfires

162 sources
2010 Accord

How to Fix Your 2010 Honda Accord by Pulling a Fuse

99 sources
2020 Accord

Why Your 2020 Honda Accord Stalls (It's Not the Battery)

540 sources