Can I insist my Nissan Almera's engine management problem is fixed following the fitting of a new exhaust?

I took my Nissan Almera 2002 1.8 Auto to a garage had new complete exhaust fitted at cost of £348. Soon after, the engine management light came on. The garage checked it and said it was O2 reading new carbon deposits. They reset the code. The warning light came on again after a short drive. Can you tell me to what extent I can insist that the garage remedies the problem? It didn't exist before the exhaust change.

Asked on 3 July 2010 by johnmckellar

Answered by Honest John
You can insist to 100 per cent. They caused it.
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