The Quick Answer above is the generic definition. What follows is the model-specific detail for the Toyota models that log P0135.
DTC/P0135·Toyota
P0135 on Toyota: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)Toyota
P0135 on a Toyota means the internal heater element of your upstream (Bank 1, Sensor 1) oxygen sensor has failed, so the sensor warms up too slowly and the engine delays entering closed-loop fuel control. The most common cause is simple heater wear inside the sensor. Because this pre-catalyst sensor sets the air-fuel mixture, you mainly notice a check engine light and worse cold-start fuel economy. A replacement upstream O2 sensor costs roughly 100 to 300 EUR including labour, or up to about 400 EUR with an OEM-quality part.
Typical repair cost, all makes€1 - €400
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Toyota Camry
2007-2024The upstream sensor on the Camry is mounted on the exhaust manifold and exposed to the highest temperatures. Match the part number on the sensor you remove when you order a replacement. On the 2AR-FE four-cylinder the sensor is accessible from the engine bay without a lift, so DIY replacement is realistic. V6 models have two banks, so confirm Bank 1 is the bank containing cylinder 1.
What causes P0135 on a Toyota?
Beyond the generic causes listed on the main P0135 page, these are the patterns noted for Toyota models:
Toyota CamryStandard heater element wear from high exhaust manifold temperatures
Toyota CamryConnector corrosion from repeated engine-bay heat cycling
How to diagnose P0135 on a Toyota with OBD2
Follow these steps to pinpoint the root cause of P0135:
- Read all stored codes and note whether other heater codes (P0141, P0155, P0161) are present. Multiple heater codes together usually point to a shared fuse, relay, or wiring fault rather than one sensor
- Locate and check the O2 sensor heater fuse in the fuse box. Replace it if blown and recheck before condemning the sensor
- Unplug the Bank 1 Sensor 1 connector and measure heater resistance across the two heater pins. A healthy heater reads roughly 2-15 ohms. An open circuit (infinite reading) means the element has burned out, under 1 ohm suggests a short
- Inspect the connector and pins for corrosion, melting, bent terminals, or water intrusion, and clean or repair as needed
- Back-probe the connector with the key on and check for battery voltage on the heater supply wire. No voltage points to a fuse, relay, or wiring fault upstream of the sensor
- Inspect the sensor wiring along its full run for chafing or melting against the exhaust manifold and heat shields, then clear the code and confirm it does not return
How much does P0135 cost to fix on a Toyota? (EUR)
Estimated repair costs for P0135 in EUR, compiled across makes. Toyota costs typically sit in the middle of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0135
These codes are often seen alongside P0135 or point to related issues, on any make:
Looking for the full P0135 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0135 guideSkanyx · Toyota
Diagnose P0135 on your Toyota
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