P0135 on the Redesigned 2022 Toyota Tundra
The 2022 Toyota Tundra introduced a completely new powertrain: the V35A-FTS 3.5-liter twin-turbocharged V6 engine producing 389 horsepower and 479 lb-ft of torque, replacing the legendary 5.7L V8. A P0135 code on this new engine means the heater circuit in the Bank 1, Sensor 1 oxygen sensor has failed. On the twin-turbo V6, Bank 1 is one side of the V6 configuration, and the upstream O2 sensor is positioned in a demanding thermal environment between the exhaust manifold and the turbocharger.
Twin-Turbo Exhaust Challenges
The twin-turbo V6 creates exhaust gas temperatures far higher than the previous naturally aspirated V8. Each bank has its own turbocharger, and the upstream O2 sensors sit in the hottest part of the exhaust path. The heater element must function reliably in temperatures exceeding 1,600°F at the surrounding exhaust components. This places enormous thermal stress on both the sensor and its wiring.
Causes of P0135 on the 2022 Tundra
- Sensor heater failure from thermal stress (High Likelihood): The twin-turbo exhaust environment is extremely demanding. The Denso OEM sensor heater may fail prematurely due to the intense heat cycling near the turbocharger. On a relatively new truck, this likely indicates either a design margin issue or a manufacturing defect, both covered under warranty.
- Heat-damaged wiring or connector (Medium Likelihood): The wiring between the O2 sensor and the connector runs through an area of extreme heat near the turbocharger. Even with proper heat shielding, insulation can degrade. Check for melted, discolored, or crumbling wire insulation.
- Blown fuse (Medium Likelihood): The O2 heater fuse in the engine compartment fuse box should be checked first. On the V6, each bank may have a separate fuse or share one. Check for both P0135 and P0155 codes.
- ECM software calibration (Low Likelihood): The twin-turbo V6 is a new design for Toyota. Early production vehicles may have ECM calibration that sets codes at inappropriate thresholds. Check for TSBs and ECM updates at the dealer.
Diagnosis
Dealer Warranty Repair
Your 2022 Tundra is fully covered under the 8-year/80,000-mile federal emissions warranty and the 3-year/36,000-mile basic warranty. The twin-turbo engine's complexity makes this a dealer repair, not a DIY project. The sensors are in tight locations near the turbochargers, requiring specialized access and knowledge.
What to Expect at the Dealer
The technician will scan for codes, test heater circuit resistance and power supply, inspect the turbo-area wiring for heat damage, check for applicable TSBs, and replace the sensor if needed. The dealer may also update the ECM software if Toyota has released a revised calibration.
Verifying the Code
Before your appointment, use an OBD-II scanner to confirm P0135. Note if any other codes are present. Checking the fuse is the only safe DIY diagnostic step on this twin-turbo engine. Leave everything else to the dealer.
Cost Reference
Under warranty: free. For future reference: OEM Denso sensor for the V35A-FTS twin-turbo costs $100 to $190. Shop labor is $150 to $250 due to turbo-area access difficulty. Total out-of-pocket after warranty: $250 to $440. This is not a recommended DIY repair due to the tight turbo packaging and risk of damaging expensive turbo components.
Why Prompt Repair Matters
The twin-turbo V6 relies on precise fuel management for performance, efficiency, and turbocharger longevity. Rich running during cold starts can increase carbon buildup on intake valves (a concern with direct injection) and in the turbo inlets. The 2022 Tundra's powerful new engine deserves proper sensor function. Since the repair is free under warranty, schedule your dealer visit as soon as possible.