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When you see the P1135 trouble code pop up on your Toyota Tacoma, it's likely indicating that there's a problem with the oxygen sensor. This error code specifically points to a malfunctioning Air Fuel Ratio (A/F) Sensor, also known as the AFR Sensor. Over time, older Tacomas can accumulate a fair amount of debris and build-up in their parts. Despite your best efforts at regular maintenance, it's common for dirt and carbon to accumulate on a vehicle that's been in use for a long time. The particular sensor in question is similar to the front oxygen sensor and can usually be cleaned easily with a penetrating catalyst or brake cleaner. If cleaning doesn't do the trick and the component seems beyond repair, you may need to consider replacing it. Ultimately, this sensor is likely the cause of the P1135 trouble code, but the good news is that replacing it is a relatively straightforward process.
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The OBD-II code P1135 points to a common issue with the air/fuel sensor circuit for the first sensor on bank 1. In order to generate accurate voltage signals, this sensor needs to reach a minimum operating temperature of at least 1200 degrees Fahrenheit.