P0135 on a 2017 Toyota Tacoma
O2 Sensor Heater Circuit (Bank 1 Upstream)
P0135 on a 2017 Toyota Tacoma indicates o2 sensor heater circuit (bank 1 upstream). It usually stays drivable short-term but should be diagnosed promptly. The most common cause is failed o2 sensor heater element (open or shorted internally) (typically $150–$450). Confirm the root cause before replacing parts.
What does P0135 mean on a 2017 Toyota Tacoma?
P0135 is set when the ECM detects that the heater element built into the Bank 1 upstream oxygen sensor is not drawing the expected current when commanded on. Zirconium O2 sensors only produce a usable signal above approximately 350 °C / 660 °F, so they include an internal heater that brings them to operating temperature quickly after cold start. P0135 means that heater is open, shorted, or being under-powered.
This guide covers P0135 across the 2015-2019 Toyota Tacoma generation — the symptoms, causes, and diagnostic steps below apply to every model year from 2015 through 2019.
Is it safe to drive a 2017 Toyota Tacoma with P0135?
In most cases a 2017 Toyota Tacoma stays drivable for short trips with P0135 active, but diagnose and repair it promptly. This is a moderate-severity code — ignoring it can lead to further damage or a failed emissions test.
What are the symptoms of P0135 on a 2017 Toyota Tacoma?
- Check Engine Light is illuminated
- Extended open-loop fuel-trim period after cold start (worse fuel economy until warm)
- Slow O2 sensor switching that may take several minutes to begin after cold start
- Possible drivability symptoms if the engine remains in open loop too long
- Vehicle may fail emissions / smog test
What causes P0135 on a 2017 Toyota Tacoma?
| Cause | Likelihood | Estimated repair (USD) |
|---|---|---|
| Failed O2 sensor heater element (open or shorted internally) | Most common | $150–$450 |
| Blown O2 heater fuse Always check the fuse before condemning the sensor. | Common | $5–$30 |
| Damaged sensor wiring (chafed against exhaust) | Common | $80–$350 |
| Corroded O2 sensor connector | Common | $30–$200 |
| Failed O2 heater relay (on vehicles with one) | Occasional | $30–$150 |
| Failed PCM driver for the heater circuit (rare) | Rare | $400–$1,500 |
How to diagnose this on a 2017 Toyota Tacoma
-
Check the O2 heater fuse first
Most vehicles route O2 heater power through a dedicated fuse, usually labeled "O2H" or "O2 SNSR" in the underhood fuse box. Replace any blown fuse with the exact amperage rating. If the fuse blows again immediately, the heater or its wiring is shorted.
Tools: Replacement fuse, Fuse puller
-
Measure heater resistance at the sensor
Unplug the Bank 1 upstream O2 sensor. Measure resistance across the heater terminals (typically the two same-color wires — consult the wiring diagram). Expected resistance is approximately 3 to 15 Ω cold, depending on the sensor. Infinite resistance means an open heater; near zero means a shorted heater.
Tools: Multimeter, Wiring diagram
-
Verify power and ground at the connector
With the key on and engine running, back-probe the heater power and ground wires. Battery voltage should be present on power and a clean ground on the other side. Missing voltage points to the fuse, the wiring, or the PCM driver.
Tools: Multimeter, Back-probe pins
-
Measure heater current draw
A working heater draws approximately 0.8 to 2 A depending on sensor design. Use a low-current clamp around the heater wire, or a multimeter in series. Current of 0 A with voltage present means the heater is open. Current well above 2 A means the heater is partially shorted and will fail soon.
Tools: Multimeter with current function, Low-current clamp (preferred)
-
Inspect the sensor and its wiring for physical damage
O2 sensor harnesses run close to hot exhaust components and are a common chafing victim. Inspect the wiring from the connector to the sensor body. Heat-damaged insulation, melted plastic, or visible copper requires harness repair or replacement, not just a new sensor.
Tools: Flashlight, Wire repair supplies
NHTSA complaints & recalls for the 2017 Toyota Tacoma
Owner-reported safety complaints and official recalls filed with the U.S. National Highway Traffic Safety Administration for the 2017 Toyota Tacoma. Use these to gauge how common a problem is on your specific vehicle before you start chasing Toyota Tacoma diagnostics.
- POWER TRAIN 67
- ENGINE 35
- UNKNOWN OR OTHER 35
- SERVICE BRAKES 30
- STRUCTURE 25
5 active recalls
- EQUIPMENT:OTHER:LABELS Dec 2017
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2017-2018 Toyota 4Runner and Tundra, 2018 Toyota Highlander, RAV4 and Lexus GX460 and 2017 Toyota Sienna and Tacoma vehicles. These vehicles may have incorrect load carrying capacity modification labels. As…
NHTSA campaign 17V831000 - ENGINE Jun 2017
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2016-2017 Tacoma vehicles equipped with a six-cylinder engine. The affected vehicles have a crank position sensor that may malfunction, potentially resulting in an engine stall.…
NHTSA campaign 17V356000 - POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT Apr 2017
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2016-2017 Tacoma vehicles. Oil may leak from the area where the rear differential carrier is assembled to rear axle housing.…
NHTSA campaign 17V285000 - SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM Apr 2018
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2018 Toyota Camry and Highlander vehicles, 2017 Toyota Sienna and Tacoma vehicles and 2017 Lexus RX350 vehicles. During the manufacturing process, the oil galley in the rotor for the brake booster vacuum pump…
NHTSA campaign 18V211000
How do I fix P0135 on a 2017 Toyota Tacoma?
- Replace the Bank 1 upstream O2 sensor with an OEM part
- Replace the O2 heater fuse
- Repair damaged O2 sensor wiring
- Replace the O2 heater relay
- Clean or repair the O2 sensor connector
About the 2015-2019 Toyota Tacoma
The 2015-2019 Toyota Tacoma was commonly sold with the following powertrains: 2.7L I4, 3.5L V6, 4.0L V6. Common trims include SR, SR5, TRD Sport, TRD Off-Road, Limited.
Why heater failure matters
Zirconium O2 sensors produce no usable signal until they reach about 350 °C. Without the heater, the sensor waits for exhaust heat to bring it up to temperature — which can take 5+ minutes of driving. During that period the ECM runs in “open loop” mode, using a calibrated fueling map rather than O2 feedback. This is fine briefly but causes poor cold-running emissions and 10–20 % worse fuel economy while the heater is dead.
P0135 with the sensor only weeks old
Aftermarket O2 sensors fail at much higher rates than OEM. If P0135 appeared shortly after an O2 sensor replacement with a non-OEM part, the new sensor itself is the most likely problem. Warranty-exchange for an OEM-equivalent before chasing the wiring.
Heater current and the “weak heater”
A heater that draws low current but is not fully open is a “weak” heater. It will warm the sensor partially, allowing the sensor to work but slowly. The ECM eventually sets P0135 even though the heater is not fully dead. A current measurement is the only reliable way to catch this failure mode — a simple resistance check often misses it.
P0135 on a 2017 Toyota Tacoma: frequently asked questions
What does diagnostic trouble code P0135 mean on a 2017 Toyota Tacoma?
P0135 is set when the ECM detects that the heater element built into the Bank 1 upstream oxygen sensor is not drawing the expected current when commanded on. Zirconium O2 sensors only produce a usable signal above approximately 350 °C / 660 °F, so they include an internal heater that brings them to operating temperature quickly after cold start. P0135 means that heater is open, shorted, or being under-powered.
What are the symptoms of P0135 on a 2017 Toyota Tacoma?
Check Engine Light is illuminated. Extended open-loop fuel-trim period after cold start (worse fuel economy until warm). Slow O2 sensor switching that may take several minutes to begin after cold start. Possible drivability symptoms if the engine remains in open loop too long. Vehicle may fail emissions / smog test
What causes P0135 on a 2017 Toyota Tacoma?
Failed O2 sensor heater element (open or shorted internally) (most-common). Blown O2 heater fuse (common). Damaged sensor wiring (chafed against exhaust) (common). Corroded O2 sensor connector (common). Failed O2 heater relay (on vehicles with one) (occasional). Failed PCM driver for the heater circuit (rare) (rare)
Is it safe to drive a 2017 Toyota Tacoma with P0135?
In most cases a 2017 Toyota Tacoma stays drivable for short trips with P0135 active, but it should be diagnosed and repaired promptly — this is a moderate-severity code. Ignoring it can lead to further damage or a failed emissions test.