![]() ![]() Downstream O2 sensors do not affect engine performance Any fault in this sensor can cause all sorts of performance issues in your Odyssey. The upstream O2 sensor helps in maintaining proper air to fuel ratio in the combustion chambers for maximum fuel efficiency and engine performance. But the most important one is the upstream O2 sensor, the one that is closest to the engine, usually in the exhaust manifold. There are multiple O2 sensors in Honda Odyssey, how many depends on vehicle configuration and model year. Plus, in many cars, the air fuel ratio sensor deteriorates over time anyway.Upstream and downstream O2 sensors Upstream O2 sensors are important for engine performance This make sense to eliminate the possibility of the sensor having intermittent problems. When repairing the code p0134, your mechanic may recommend replacing the air fuel ratio sensor first, even if it appears to be working at the moment. When the engine is revved, the signal should change. See Honda air fuel ratio sensor current displayed on a scan tool. The signal voltage or current should stay within specified value. ![]() The air fuel ratio sensor readings are checked after the engine is fully warmed up. How the air fuel ratio sensor is checked with a scan tool: If no other problems found, the sensor must be replaced. Next, the wiring between the PCM and the air fuel sensor must be tested. In a V6 or V8 engine, if there is a code P0154 Oxygen (A/F) Sensor No Activity Detected (Bank 2 Sensor 1) stored along with the P0134, the problem is more likely not with the oxygen sensors, as both sensors would not go at the same time.įirst, the air/fuel ratio sensor connector, as well as the sensor power and ground must be checked. If there are other trouble codes stored along with the P0134, they might need to be looked at first. In some Volkswagen cars, a bad mass air flow sensor could cause a lean condition that could in turn cause the code P0134 along with some other fault codes. A new air/fuel ratio sensor usually fixes the problem. In some Hyundai V6 engines, a faulty oxygen sensor could cause the code P0134 along with misfiring codes (P030x) and rich condition replacing the oxygen sensor should solve the problem.Ī TSB for 2000-2001 Nissan Maxima mentions possible intermittent connection at the ECM causing the code P0134 or others.Ī bad front air/fuel ratio sensor causing the code P0134 is a common occurrence in some Honda vehicles. Honda recommends replacing the A/F sensor and installing a sub-harness kit as a solution. open or short at the oxygen sensor heater circuitĪ service bulletin for 2006-2008 Honda Civic Si describes a problem where the grease would drip onto the air/fuel (A/F) ratio sensor connector causing the code P0134 or some other codes. open or short in the oxygen sensor wiring or connector a faulty air/fuel ratio sensor (front oxygen sensor) Often this code is caused by a faulty air/fuel ratio sensor, but there are other possibilities: The code P0134 means that the signal from the air fuel ratio sensor does not change for a certain time when the necessary conditions (engine temperature, rpm, etc.) are met. Read more about the air fuel ratio sensor. Based on its signal, the engine computer adjusts the fuel/air ratio to keep it at the optimum level. The air fuel (A/F) ratio sensor or as it's often called front oxygen sensor (Bank 1 Sensor 1), measures the amount of oxygen in the exhaust. Signs of automatic transmission problems.How to check the engine when buying a used car.How to get the best deal on a used car?.Buying a Used Car: 10 Common Mistakes to Avoid. ![]()
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