P0402 on Nissan qashqai
Hello having a nightmare with my partners Nissan qashqai 2016 plate. A while a go the check engine light came on about the glow plugs. My partner drive around with it on for a few weeks before telling me. Needless to say it escalated into something about both the glow plugs and EGR. Took it to the garage and my father in law sorted it for my partner and spoke to the garage. A week later a red check engine light came on and we took it back and apparently they gave the EGR a clean or something. Today a couple weeks later a normal check engine light came on with P0402 fault. Am unsure what to do with the car I thought the EGR had been replaced from what the garage and my father in law said but now im not so sure. Any advice would be appreciated