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2004 Honda Accord EX V6 P0134 and P2243 Fault Code Diagnosis: Which Sensor to Replace?

Model: 2004 Accord EX V6 Fault Code: P0134 Posted: 2020-04-19 22:22

Hi everyone, I'm currently experiencing two diagnostic trouble codes on my 2004 Honda Accord EX V6: P0134 and P2243. Both codes point to issues with the air-fuel ratio sensor (also known as the A/F Ratio Sensor), but I want to make sure I'm replacing the correct component. Is it one sensor or do I need to replace two parts? Additionally, are there any common wiring or circuit issues that should be checked before assuming a faulty sensor? I'd appreciate any guidance on identifying the right part and troubleshooting steps. Thanks in advance! Mike

Related fault codes
P0134P2243
Comments (8)
Anonymous 2020-04-20 07:49

The P0134 and P2243 codes typically indicate a problem with the Air-Fuel Ratio (A/F) Sensor, which is distinct from a standard oxygen sensor. This sensor is located in the exhaust manifold on the engine side near the firewall. Before replacing it, always inspect the wiring harness, connectors, fuses, and related circuits—these are common failure points. If the sensor is indeed faulty, it's recommended to purchase directly from your Honda dealership rather than aftermarket brands, as they offer OEM-compatible parts with proper fitment and performance. For more details: https://www.honda.com/support/p2243

Anonymous 2020-04-20 11:56

Thanks for the tip—I called my local Honda dealership and confirmed they carry this part. It's quite expensive, priced at $261.

Anonymous 2020-04-21 07:26

Have you already checked the electrical circuit? A faulty sensor is not always the root cause—wiring issues or connector problems can mimic sensor faults. Given the cost of $261, I'd recommend troubleshooting the circuit first before replacing the sensor.

Anonymous 2020-04-21 10:17

I'm checking the wiring and connectors this morning. If everything looks good, I'll head to Advance Auto Parts to pick up a Denso A/F Ratio Sensor. My car has 166,000 miles on it, and I've been considering switching to a truck or SUV—this repair is going to be a key step in keeping it running. I’ll update you once I have results, probably tomorrow. I work the second shift, so I don’t have much time this morning. Thanks for your help!

Anonymous 2020-04-21 15:21

Denso does manufacture A/F Ratio Sensors specifically designed for Honda vehicles. If purchasing from an aftermarket source, ensure it comes with a proper connector (plug) and not just bare wires—this ensures compatibility and reliable connection.

Anonymous 2020-04-26 15:39

Thanks so much for the advice! I installed the Denso A/F Ratio Sensor yesterday. The check engine light is now off—great relief. I'm really grateful for your help. Stay safe!

Anonymous 2020-04-27 07:36

Congratulations on resolving the issue! Your experience and update are very helpful to other owners facing similar problems.

Anonymous 2020-04-27 10:09