2004 Mazda MPV P0000 Fault After Battery Replacement and Engine Power Wash

The battery in our 2004 Mazda MPV ES with a 3.0L Ford Duratec engine was showing signs of failure. We replaced the battery, and during the process, we performed an engine power wash using diluted degreaser and a pressure washer with a wide spray pattern to avoid high-pressure contact on any single area. This procedure has been successfully used on previous vehicles including a Chevrolet van, Toyota models, and my sister’s VW—no issues were observed in those cases. After completing the wash, we started the vehicle and drove it for about 5 minutes with no immediate problems. However, approximately 30 minutes later, my wife reported that the engine was running roughly and the Check Engine Light (CEL) illuminated. Upon connecting a ScanGage 2 device, we retrieved fault code P0000. Vehicle details: - 2004 Mazda MPV ES 3.0L (Ford Durate or equivalent) - 62,000 miles - Fault code P0000 triggered after battery replacement and engine power wash - Engine runs roughly, especially under acceleration I am concerned whether the power wash may have affected sensitive components, particularly given that this fault code is associated with oxygen sensor or sensor-related issues. I'm seeking advice on possible causes and solutions for this specific scenario.